/*
 *
 * TableSorter 2.0 - Client-side table sorting with ease!
 * Version 2.0.3
 * @requires jQuery v1.2.3
 *
 * Copyright (c) 2007 Christian Bach
 * Examples and docs at: http://tablesorter.com
 * Dual licensed under the MIT and GPL licenses:
 * http://www.opensource.org/licenses/mit-license.php
 * http://www.gnu.org/licenses/gpl.html
 *
 */
/**
 *
 * @description Create a sortable table with multi-column sorting capabilitys
 *
 * @example $('table').tablesorter();
 * @desc Create a simple tablesorter interface.
 *
 * @example $('table').tablesorter({ sortList:[[0,0],[1,0]] });
 * @desc Create a tablesorter interface and sort on the first and secound column in ascending order.
 *
 * @example $('table').tablesorter({ headers: { 0: { sorter: false}, 1: {sorter: false} } });
 * @desc Create a tablesorter interface and disableing the first and secound column headers.
 *
 * @example $('table').tablesorter({ 0: {sorter:"integer"}, 1: {sorter:"currency"} });
 * @desc Create a tablesorter interface and set a column parser for the first and secound column.
 *
 *
 * @param Object settings An object literal containing key/value pairs to provide optional settings.
 *
 * @option String cssHeader (optional)                         A string of the class name to be appended to sortable tr elements in the thead of the table.
 *                                                                                                 Default value: "header"
 *
 * @option String cssAsc (optional)                         A string of the class name to be appended to sortable tr elements in the thead on a ascending sort.
 *                                                                                                 Default value: "headerSortUp"
 *
 * @option String cssDesc (optional)                         A string of the class name to be appended to sortable tr elements in the thead on a descending sort.
 *                                                                                                 Default value: "headerSortDown"
 *
 * @option String sortInitialOrder (optional)         A string of the inital sorting order can be asc or desc.
 *                                                                                                 Default value: "asc"
 *
 * @option String sortMultisortKey (optional)         A string of the multi-column sort key.
 *                                                                                                 Default value: "shiftKey"
 *
 * @option String textExtraction (optional)         A string of the text-extraction method to use.
 *                                                                                                 For complex html structures inside td cell set this option to "complex",
 *                                                                                                 on large tables the complex option can be slow.
 *                                                                                                 Default value: "simple"
 *
 * @option Object headers (optional)                         An array containing the forces sorting rules.
 *                                                                                                 This option let's you specify a default sorting rule.
 *                                                                                                 Default value: null
 *
 * @option Array sortList (optional)                         An array containing the forces sorting rules.
 *                                                                                                 This option let's you specify a default sorting rule.
 *                                                                                                 Default value: null
 *
 * @option Array sortForce (optional)                         An array containing forced sorting rules.
 *                                                                                                 This option let's you specify a default sorting rule, which is prepended to user-selected rules.
 *                                                                                                 Default value: null
 *
  * @option Array sortAppend (optional)                         An array containing forced sorting rules.
 *                                                                                                 This option let's you specify a default sorting rule, which is appended to user-selected rules.
 *                                                                                                 Default value: null
 *
 * @option Boolean widthFixed (optional)                 Boolean flag indicating if tablesorter should apply fixed widths to the table columns.
 *                                                                                                 This is usefull when using the pager companion plugin.
 *                                                                                                 This options requires the dimension jquery plugin.
 *                                                                                                 Default value: false
 *
 * @option Boolean cancelSelection (optional)         Boolean flag indicating if tablesorter should cancel selection of the table headers text.
 *                                                                                                 Default value: true
 *
 * @option Boolean debug (optional)                         Boolean flag indicating if tablesorter should display debuging information usefull for development.
 *
 * @type jQuery
 *
 * @name tablesorter
 *
 * @cat Plugins/Tablesorter
 *
 * @author Christian Bach/christian.bach@polyester.se
 */

(function($) {
        $.extend({
                tablesorter: new function() {

                        var parsers = [], widgets = [];

                        this.defaults = {
                                cssHeader: "header",
                                cssAsc: "headerSortUp",
                                cssDesc: "headerSortDown",
                                sortInitialOrder: "asc",
                                sortMultiSortKey: "shiftKey",
                                sortForce: null,
                                sortAppend: null,
                                textExtraction: "simple",
                                parsers: {},
                                widgets: [],
                                widgetZebra: {css: ["even","odd"]},
                                headers: {},
                                widthFixed: false,
                                cancelSelection: true,
                                sortList: [],
                                headerList: [],
                                dateFormat: "us",
                                decimal: '.',
                                debug: false
                        };

                        /* debuging utils */
                        function benchmark(s,d) {
                                log(s + "," + (new Date().getTime() - d.getTime()) + "ms");
                        }

                        this.benchmark = benchmark;

                        function log(s) {
                                if (typeof console != "undefined" && typeof console.debug != "undefined") {
                                        console.log(s);
                                } else {
                                        alert(s);
                                }
                        }

                        /* parsers utils */
                        function buildParserCache(table,$headers) {

                                if(table.config.debug) { var parsersDebug = ""; }

                                var rows = table.tBodies[0].rows;

                                if(table.tBodies[0].rows[0]) {

                                        var list = [], cells = rows[0].cells, l = cells.length;

                                        for (var i=0;i < l; i++) {
                                                var p = false;

                                                if($.metadata && ($($headers[i]).metadata() && $($headers[i]).metadata().sorter)  ) {

                                                        p = getParserById($($headers[i]).metadata().sorter);

                                                } else if((table.config.headers[i] && table.config.headers[i].sorter)) {

                                                        p = getParserById(table.config.headers[i].sorter);
                                                }
                                                if(!p) {
                                                        p = detectParserForColumn(table,cells[i]);
                                                }

                                                if(table.config.debug) { parsersDebug += "column:" + i + " parser:" +p.id + "\n"; }

                                                list.push(p);
                                        }
                                }

                                if(table.config.debug) { log(parsersDebug); }

                                return list;
                        };

                        function detectParserForColumn(table,node) {
                                var l = parsers.length;
                                for(var i=1; i < l; i++) {
                                        if(parsers[i].is($.trim(getElementText(table.config,node)),table,node)) {
                                                return parsers[i];
                                        }
                                }
                                // 0 is always the generic parser (text)
                                return parsers[0];
                        }

                        function getParserById(name) {
                                var l = parsers.length;
                                for(var i=0; i < l; i++) {
                                        if(parsers[i].id.toLowerCase() == name.toLowerCase()) {
                                                return parsers[i];
                                        }
                                }
                                return false;
                        }

                        /* utils */
                        function buildCache(table) {

                                if(table.config.debug) { var cacheTime = new Date(); }


                                var totalRows = (table.tBodies[0] && table.tBodies[0].rows.length) || 0,
                                        totalCells = (table.tBodies[0].rows[0] && table.tBodies[0].rows[0].cells.length) || 0,
                                        parsers = table.config.parsers,
                                        cache = {row: [], normalized: []};

                                        for (var i=0;i < totalRows; ++i) {

                                                /** Add the table data to main data array */
                                                var c = table.tBodies[0].rows[i], cols = [];

                                                cache.row.push($(c));

                                                for(var j=0; j < totalCells; ++j) {
                                                        cols.push(parsers[j].format(getElementText(table.config,c.cells[j]),table,c.cells[j]));
                                                }

                                                cols.push(i); // add position for rowCache
                                                cache.normalized.push(cols);
                                                cols = null;
                                        };

                                if(table.config.debug) { benchmark("Building cache for " + totalRows + " rows:", cacheTime); }

                                return cache;
                        };

                        function getElementText(config,node) {

                                if(!node) return "";

                                var t = "";

                                if(config.textExtraction == "simple") {
                                        if(node.childNodes[0] && node.childNodes[0].hasChildNodes()) {
                                                t = node.childNodes[0].innerHTML;
                                        } else {
                                                t = node.innerHTML;
                                        }
                                } else {
                                        if(typeof(config.textExtraction) == "function") {
                                                t = config.textExtraction(node);
                                        } else {
                                                t = $(node).text();
                                        }
                                }
                                return t;
                        }

                        function appendToTable(table,cache) {

                                if(table.config.debug) {var appendTime = new Date()}

                                var c = cache,
                                        r = c.row,
                                        n= c.normalized,
                                        totalRows = n.length,
                                        checkCell = (n[0].length-1),
                                        tableBody = $(table.tBodies[0]),
                                        rows = [];

                                for (var i=0;i < totalRows; i++) {
                                        rows.push(r[n[i][checkCell]]);
                                        if(!table.config.appender) {

                                                var o = r[n[i][checkCell]];
                                                var l = o.length;
                                                for(var j=0; j < l; j++) {

                                                        tableBody[0].appendChild(o[j]);

                                                }

                                                //tableBody.append(r[n[i][checkCell]]);
                                        }
                                }

                                if(table.config.appender) {

                                        table.config.appender(table,rows);
                                }

                                rows = null;

                                if(table.config.debug) { benchmark("Rebuilt table:", appendTime); }

                                //apply table widgets
                                applyWidget(table);

                                // trigger sortend
                                setTimeout(function() {
                                        $(table).trigger("sortEnd");
                                },0);

                        };

                        function buildHeaders(table) {

                                if(table.config.debug) { var time = new Date(); }

                                var meta = ($.metadata) ? true : false, tableHeadersRows = [];

                                for(var i = 0; i < table.tHead.rows.length; i++) { tableHeadersRows[i]=0; };

                                $tableHeaders = $("thead th",table);

                                $tableHeaders.each(function(index) {

                                        this.count = 0;
                                        this.column = index;
                                        this.order = formatSortingOrder(table.config.sortInitialOrder);

                                        if(checkHeaderMetadata(this) || checkHeaderOptions(table,index)) this.sortDisabled = true;

                                        if(!this.sortDisabled) {
                                                $(this).addClass(table.config.cssHeader);
                                        }

                                        // add cell to headerList
                                        table.config.headerList[index]= this;
                                });

                                if(table.config.debug) { benchmark("Built headers:", time); log($tableHeaders); }

                                return $tableHeaders;

                        };

                           function checkCellColSpan(table, rows, row) {
                var arr = [], r = table.tHead.rows, c = r[row].cells;

                                for(var i=0; i < c.length; i++) {
                                        var cell = c[i];

                                        if ( cell.colSpan > 1) {
                                                arr = arr.concat(checkCellColSpan(table, headerArr,row++));
                                        } else  {
                                                if(table.tHead.length == 1 || (cell.rowSpan > 1 || !r[row+1])) {
                                                        arr.push(cell);
                                                }
                                                //headerArr[row] = (i+row);
                                        }
                                }
                                return arr;
                        };

                        function checkHeaderMetadata(cell) {
                                if(($.metadata) && ($(cell).metadata().sorter === false)) { return true; };
                                return false;
                        }

                        function checkHeaderOptions(table,i) {
                                if((table.config.headers[i]) && (table.config.headers[i].sorter === false)) { return true; };
                                return false;
                        }

                        function applyWidget(table) {
                                var c = table.config.widgets;
                                var l = c.length;
                                for(var i=0; i < l; i++) {

                                        getWidgetById(c[i]).format(table);
                                }

                        }

                        function getWidgetById(name) {
                                var l = widgets.length;
                                for(var i=0; i < l; i++) {
                                        if(widgets[i].id.toLowerCase() == name.toLowerCase() ) {
                                                return widgets[i];
                                        }
                                }
                        };

                        function formatSortingOrder(v) {

                                if(typeof(v) != "Number") {
                                        i = (v.toLowerCase() == "desc") ? 1 : 0;
                                } else {
                                        i = (v == (0 || 1)) ? v : 0;
                                }
                                return i;
                        }

                        function isValueInArray(v, a) {
                                var l = a.length;
                                for(var i=0; i < l; i++) {
                                        if(a[i][0] == v) {
                                                return true;
                                        }
                                }
                                return false;
                        }

                        function setHeadersCss(table,$headers, list, css) {
                                // remove all header information
                                $headers.removeClass(css[0]).removeClass(css[1]);

                                var h = [];
                                $headers.each(function(offset) {

                                                if(!this.sortDisabled) {
                                                        h[this.column] = $(this);

                                                }
                                });

                                var l = list.length;
                                for(var i=0; i < l; i++) {
                                        h[list[i][0]].addClass(css[list[i][1]]);
                                }
                        }

                        function fixColumnWidth(table,$headers) {
                                var c = table.config;
                                if(c.widthFixed) {
                                        var colgroup = $('<colgroup>');
                                        $("tr:first td",table.tBodies[0]).each(function() {
                                                colgroup.append($('<col>').css('width',$(this).width()));
                                        });
                                        $(table).prepend(colgroup);
                                };
                        }

                        function updateHeaderSortCount(table,sortList) {
                                var c = table.config, l = sortList.length;
                                for(var i=0; i < l; i++) {
                                        var s = sortList[i], o = c.headerList[s[0]];
                                        o.count = s[1];
                                        o.count++;
                                }
                        }

                        /* sorting methods */
                        function multisort(table,sortList,cache) {

                                if(table.config.debug) { var sortTime = new Date(); }

                                var dynamicExp = "var sortWrapper = function(a,b) {", l = sortList.length;

                                for(var i=0; i < l; i++) {

                                        var c = sortList[i][0];
                                        var order = sortList[i][1];
                                        var s = (getCachedSortType(table.config.parsers,c) == "text") ? ((order == 0) ? "sortText" : "sortTextDesc") : ((order == 0) ? "sortNumeric" : "sortNumericDesc");

                                        var e = "e" + i;

                                        dynamicExp += "var " + e + " = " + s + "(a[" + c + "],b[" + c + "]); ";
                                        dynamicExp += "if(" + e + ") { return " + e + "; } ";
                                        dynamicExp += "else { ";
                                }

                                // if value is the same keep orignal order
                                var orgOrderCol = cache.normalized[0].length - 1;
                                dynamicExp += "return a[" + orgOrderCol + "]-b[" + orgOrderCol + "];";

                                for(var i=0; i < l; i++) {
                                        dynamicExp += "}; ";
                                }

                                dynamicExp += "return 0; ";
                                dynamicExp += "}; ";

                                eval(dynamicExp);

                                cache.normalized.sort(sortWrapper);

                                if(table.config.debug) { benchmark("Sorting on " + sortList.toString() + " and dir " + order+ " time:", sortTime); }

                                return cache;
                        };

                        function sortText(a,b) {
                                return ((a < b) ? -1 : ((a > b) ? 1 : 0));
                        };

                        function sortTextDesc(a,b) {
                                return ((b < a) ? -1 : ((b > a) ? 1 : 0));
                        };

                         function sortNumeric(a,b) {
                                return a-b;
                        };

                        function sortNumericDesc(a,b) {
                                return b-a;
                        };

                        function getCachedSortType(parsers,i) {
                                return parsers[i].type;
                        };

                        /* public methods */
                        this.construct = function(settings) {

                                return this.each(function() {

                                        if(!this.tHead || !this.tBodies) return;

                                        var $this, $document,$headers, cache, config, shiftDown = 0, sortOrder;

                                        this.config = {};

                                        config = $.extend(this.config, $.tablesorter.defaults, settings);

                                        // store common expression for speed
                                        $this = $(this);

                                        // build headers
                                        $headers = buildHeaders(this);

                                        // try to auto detect column type, and store in tables config
                                        this.config.parsers = buildParserCache(this,$headers);


                                        // build the cache for the tbody cells
                                        cache = buildCache(this);

                                        // get the css class names, could be done else where.
                                        var sortCSS = [config.cssDesc,config.cssAsc];

                                        // fixate columns if the users supplies the fixedWidth option
                                        fixColumnWidth(this);

                                        // apply event handling to headers
                                        // this is to big, perhaps break it out?
                                        $headers.click(function(e) {

                                                $this.trigger("sortStart");

                                                var totalRows = ($this[0].tBodies[0] && $this[0].tBodies[0].rows.length) || 0;

                                                if(!this.sortDisabled && totalRows > 0) {


                                                        // store exp, for speed
                                                        var $cell = $(this);

                                                        // get current column index
                                                        var i = this.column;

                                                        // get current column sort order
                                                        this.order = this.count++ % 2;

                                                        // user only whants to sort on one column
                                                        if(!e[config.sortMultiSortKey]) {

                                                                // flush the sort list
                                                                config.sortList = [];

                                                                if(config.sortForce != null) {
                                                                        var a = config.sortForce;
                                                                        for(var j=0; j < a.length; j++) {
                                                                                if(a[j][0] != i) {
                                                                                        config.sortList.push(a[j]);
                                                                                }
                                                                        }
                                                                }

                                                                // add column to sort list
                                                                config.sortList.push([i,this.order]);

                                                        // multi column sorting
                                                        } else {
                                                                // the user has clicked on an all ready sortet column.
                                                                if(isValueInArray(i,config.sortList)) {

                                                                        // revers the sorting direction for all tables.
                                                                        for(var j=0; j < config.sortList.length; j++) {
                                                                                var s = config.sortList[j], o = config.headerList[s[0]];
                                                                                if(s[0] == i) {
                                                                                        o.count = s[1];
                                                                                        o.count++;
                                                                                        s[1] = o.count % 2;
                                                                                }
                                                                        }
                                                                } else {
                                                                        // add column to sort list array
                                                                        config.sortList.push([i,this.order]);
                                                                }
                                                        };
                                                        setTimeout(function() {
                                                                //set css for headers
                                                                setHeadersCss($this[0],$headers,config.sortList,sortCSS);
                                                                appendToTable($this[0],multisort($this[0],config.sortList,cache));
                                                        },1);
                                                        // stop normal event by returning false
                                                        return false;
                                                }
                                        // cancel selection
                                        }).mousedown(function() {
                                                if(config.cancelSelection) {
                                                        this.onselectstart = function() {return false};
                                                        return false;
                                                }
                                        });

                                        // apply easy methods that trigger binded events
                                        $this.bind("update",function() {

                                                // rebuild parsers.
                                                this.config.parsers = buildParserCache(this,$headers);

                                                // rebuild the cache map
                                                cache = buildCache(this);

                                        }).bind("sorton",function(e,list) {

                                                $(this).trigger("sortStart");

                                                config.sortList = list;

                                                // update and store the sortlist
                                                var sortList = config.sortList;

                                                // update header count index
                                                updateHeaderSortCount(this,sortList);

                                                //set css for headers
                                                setHeadersCss(this,$headers,sortList,sortCSS);


                                                // sort the table and append it to the dom
                                                appendToTable(this,multisort(this,sortList,cache));

                                        }).bind("appendCache",function() {

                                                appendToTable(this,cache);

                                        }).bind("applyWidgetId",function(e,id) {

                                                getWidgetById(id).format(this);

                                        }).bind("applyWidgets",function() {
                                                // apply widgets
                                                applyWidget(this);
                                        });

                                        if($.metadata && ($(this).metadata() && $(this).metadata().sortlist)) {
                                                config.sortList = $(this).metadata().sortlist;
                                        }
                                        // if user has supplied a sort list to constructor.
                                        if(config.sortList.length > 0) {
                                                $this.trigger("sorton",[config.sortList]);
                                        }

                                        // apply widgets
                                        applyWidget(this);
                                });
                        };

                        this.addParser = function(parser) {
                                var l = parsers.length, a = true;
                                for(var i=0; i < l; i++) {
                                        if(parsers[i].id.toLowerCase() == parser.id.toLowerCase()) {
                                                a = false;
                                        }
                                }
                                if(a) { parsers.push(parser); };
                        };

                        this.addWidget = function(widget) {
                                widgets.push(widget);
                        };

                        this.formatFloat = function(s) {
                                var i = parseFloat(s);
                                return (isNaN(i)) ? 0 : i;
                        };
                        this.formatInt = function(s) {
                                var i = parseInt(s);
                                return (isNaN(i)) ? 0 : i;
                        };

                        this.isDigit = function(s,config) {
                                var DECIMAL = '\\' + config.decimal;
                                var exp = '/(^[+]?0(' + DECIMAL +'0+)?$)|(^([-+]?[1-9][0-9]*)$)|(^([-+]?((0?|[1-9][0-9]*)' + DECIMAL +'(0*[1-9][0-9]*)))$)|(^[-+]?[1-9]+[0-9]*' + DECIMAL +'0+$)/';
                                return RegExp(exp).test($.trim(s));
                        };

                        this.clearTableBody = function(table) {
                                if($.browser.msie) {
                                        function empty() {
                                                while ( this.firstChild ) this.removeChild( this.firstChild );
                                        }
                                        empty.apply(table.tBodies[0]);
                                } else {
                                        table.tBodies[0].innerHTML = "";
                                }
                        };
                }
        });

        // extend plugin scope
        $.fn.extend({
        tablesorter: $.tablesorter.construct
        });

        var ts = $.tablesorter;

        // add default parsers
        ts.addParser({
                id: "text",
                is: function(s) {
                        return true;
                },
                format: function(s) {
                        return $.trim(s.toLowerCase());
                },
                type: "text"
        });

        ts.addParser({
                id: "digit",
                is: function(s,table) {
                        var c = table.config;
                        return $.tablesorter.isDigit(s,c);
                },
                format: function(s) {
                        return $.tablesorter.formatFloat(s);
                },
                type: "numeric"
        });

        ts.addParser({
                id: "currency",
                is: function(s) {
                        return /^[Tã$òÂì?.]/.test(s);
                },
                format: function(s) {
                        return $.tablesorter.formatFloat(s.replace(new RegExp(/[^0-9.]/g),""));
                },
                type: "numeric"
        });

        ts.addParser({
                id: "ipAddress",
                is: function(s) {
                        return /^\d{2,3}[\.]\d{2,3}[\.]\d{2,3}[\.]\d{2,3}$/.test(s);
                },
                format: function(s) {
                        var a = s.split("."), r = "", l = a.length;
                        for(var i = 0; i < l; i++) {
                                var item = a[i];
                                   if(item.length == 2) {
                                        r += "0" + item;
                                   } else {
                                        r += item;
                                   }
                        }
                        return $.tablesorter.formatFloat(r);
                },
                type: "numeric"
        });

        ts.addParser({
                id: "url",
                is: function(s) {
                        return /^(https?|ftp|file):\/\/$/.test(s);
                },
                format: function(s) {
                        return jQuery.trim(s.replace(new RegExp(/(https?|ftp|file):\/\//),''));
                },
                type: "text"
        });

        ts.addParser({
                id: "isoDate",
                is: function(s) {
                        return /^\d{4}[\/-]\d{1,2}[\/-]\d{1,2}$/.test(s);
                },
                format: function(s) {
                        return $.tablesorter.formatFloat((s != "") ? new Date(s.replace(new RegExp(/-/g),"/")).getTime() : "0");
                },
                type: "numeric"
        });

        ts.addParser({
                id: "percent",
                is: function(s) {
                        return /\%$/.test($.trim(s));
                },
                format: function(s) {
                        return $.tablesorter.formatFloat(s.replace(new RegExp(/%/g),""));
                },
                type: "numeric"
        });

        ts.addParser({
                id: "usLongDate",
                is: function(s) {
                        return s.match(new RegExp(/^[A-Za-z]{3,10}\.? [0-9]{1,2}, ([0-9]{4}|'?[0-9]{2}) (([0-2]?[0-9]:[0-5][0-9])|([0-1]?[0-9]:[0-5][0-9]\s(AM|PM)))$/));
                },
                format: function(s) {
                        return $.tablesorter.formatFloat(new Date(s).getTime());
                },
                type: "numeric"
        });

        ts.addParser({
                id: "shortDate",
                is: function(s) {
                        return /\d{1,2}[\/\-]\d{1,2}[\/\-]\d{2,4}/.test(s);
                },
                format: function(s,table) {
                        var c = table.config;
                        s = s.replace(/\-/g,"/");
                        if(c.dateFormat == "us") {
                                // reformat the string in ISO format
                                s = s.replace(/(\d{1,2})[\/\-](\d{1,2})[\/\-](\d{4})/, "$3/$1/$2");
                        } else if(c.dateFormat == "uk") {
                                //reformat the string in ISO format
                                s = s.replace(/(\d{1,2})[\/\-](\d{1,2})[\/\-](\d{4})/, "$3/$2/$1");
                        } else if(c.dateFormat == "dd/mm/yy" || c.dateFormat == "dd-mm-yy") {
                                s = s.replace(/(\d{1,2})[\/\-](\d{1,2})[\/\-](\d{2})/, "$1/$2/$3");
                        }
                        return $.tablesorter.formatFloat(new Date(s).getTime());
                },
                type: "numeric"
        });

        ts.addParser({
            id: "time",
            is: function(s) {
                return /^(([0-2]?[0-9]:[0-5][0-9])|([0-1]?[0-9]:[0-5][0-9]\s(am|pm)))$/.test(s);
            },
            format: function(s) {
                return $.tablesorter.formatFloat(new Date("2000/01/01 " + s).getTime());
            },
          type: "numeric"
        });


        ts.addParser({
            id: "metadata",
            is: function(s) {
                return false;
            },
            format: function(s,table,cell) {
                        var c = table.config, p = (!c.parserMetadataName) ? 'sortValue' : c.parserMetadataName;
                return $(cell).metadata()[p];
            },
          type: "numeric"
        });

        // add default widgets
        ts.addWidget({
                id: "zebra",
                format: function(table) {
                        if(table.config.debug) { var time = new Date(); }
                        $("tr:visible",table.tBodies[0])
                .filter(':even')
                .removeClass(table.config.widgetZebra.css[1]).addClass(table.config.widgetZebra.css[0])
                .end().filter(':odd')
                .removeClass(table.config.widgetZebra.css[0]).addClass(table.config.widgetZebra.css[1]);
                        if(table.config.debug) { $.tablesorter.benchmark("Applying Zebra widget", time); }
                }
        });
})(jQuery);