var SORT_COLUMN_INDEX;
function sortables_init()
{
    // Find all tables with class sortable and make them sortable
    if (!document.getElementsByTagName) return;
    tbls = document.getElementsByTagName("table");
    for (ti=0; ti<tbls.length; ti++)
	{
        thisTbl = tbls[ti]; 
		//alert(thisTbl.className);
		if (((' '+thisTbl.className+' ').indexOf("sortable") != -1) && (thisTbl.id))
		{
            //initTable(thisTbl.id); 
            ts_makeSortable(thisTbl);
        }
    }
}

function ts_makeSortable(table)
{	
	//alert('called');
    if (table.rows && table.rows.length > 0)
	{
        var firstRow = table.rows[0];
    }
    if (!firstRow) return;
    
    // We have a first row: assume it's the header, and make its contents clickable links
    for (var i=0; i<firstRow.cells.length; i++)
	{
        var cell = firstRow.cells[i];
        var txt = ts_getInnerText(cell);
        cell.innerHTML = '<a href="#" class="admin-blue" onclick="ts_resortTable(this);return false;">'+txt+'<span class="sortarrow"></span></a>';
    }
}

function ts_getInnerText(el) {
	if (typeof el == "string") return el;
	if (typeof el == "undefined") { return el };
	if (el.innerText) return el.innerText;	//Not needed but it is faster
	var str = "";
	
	var cs = el.childNodes;
	var l = cs.length;
	for (var i = 0; i < l; i++) {
		switch (cs[i].nodeType) {
			case 1: //ELEMENT_NODE
				str += ts_getInnerText(cs[i]);
				break;
			case 3:	//TEXT_NODE
				str += cs[i].nodeValue;
				break;
		}
	}
	return str;
}

function ts_resortTable(lnk)
{
    // get the span
    var span;
    for (var ci=0; ci<lnk.childNodes.length; ci++)
	{
        if (lnk.childNodes[ci].tagName && lnk.childNodes[ci].tagName.toLowerCase() == 'span')
			span = lnk.childNodes[ci];
    }
    var spantext = ts_getInnerText(span);
    var td = lnk.parentNode;
    var column = td.cellIndex;
    var table = getParent(td,'TABLE');
    
    // Work out a type for the column
    if (table.rows.length <= 1)
		return;
    var itm = ts_getInnerText(table.rows[1].cells[column]);
    sortfn = ts_sort_caseinsensitive;
    if (itm.match(/^\d\d[\/-]\d\d[\/-]\d\d\d\d$/))
		sortfn = ts_sort_date;
    if (itm.match(/^\d\d[\/-]\d\d[\/-]\d\d$/))
		sortfn = ts_sort_date;
    if (itm.match(/^[£$]/))
		sortfn = ts_sort_currency;
    if (itm.match(/^[\d\.]+$/))
		sortfn = ts_sort_numeric;
    SORT_COLUMN_INDEX = column;
    var firstRow = new Array();
    var newRows = new Array();
    for (i=0;i<table.rows[0].length;i++) { firstRow[i] = table.rows[0][i]; }
    for (j=1;j<table.rows.length;j++) { newRows[j-1] = table.rows[j]; }

    newRows.sort(sortfn);

    if (span.getAttribute("sortdir") == 'down')
	{
        ARROW = '&nbsp;<font size="4">&uarr;</font><!--img src="arrow_up.gif" border="0"-->';
        newRows.reverse();
        span.setAttribute('sortdir','up');
    }
	else
	{
        ARROW = '&nbsp;<font size="4">&darr;</font><!--img src="arrow_down.gif" border="0"-->';
        span.setAttribute('sortdir','down');
    }
    
    // We appendChild rows that already exist to the tbody, so it moves them rather than creating new ones
    // don't do sortbottom rows
    for (i=0;i<newRows.length;i++)
	{ 
		if (!newRows[i].className || (newRows[i].className && (newRows[i].className.indexOf('sortbottom') == -1)))
			table.tBodies[0].appendChild(newRows[i]);
	}

	// do sortbottom rows only
    for (i=0;i<newRows.length;i++)
	{	
		if (newRows[i].className && (newRows[i].className.indexOf('sortbottom') != -1))
			table.tBodies[0].appendChild(newRows[i]);
	}
    
    // Delete any other arrows there may be showing
    var allspans = document.getElementsByTagName("span");
    for (var ci=0;ci<allspans.length;ci++)
	{
        if (allspans[ci].className == 'sortarrow')
		{
            if (getParent(allspans[ci],"table") == getParent(lnk,"table"))
			{ // in the same table as us?
                allspans[ci].innerHTML = '';
            }
        }
    }
    span.innerHTML = ARROW;
}



function getParent(el, pTagName)
{
	if (el == null) return null;
	else if (el.nodeType == 1 && el.tagName.toLowerCase() == pTagName.toLowerCase())
	// Gecko bug, supposed to be uppercase
		return el;
	else
		return getParent(el.parentNode, pTagName);
}

function ts_sort_date(a,b)
{
    // y2k notes: two digit years less than 50 are treated as 20XX, greater than 50 are treated as 19XX
    aa = ts_getInnerText(a.cells[SORT_COLUMN_INDEX]);
    bb = ts_getInnerText(b.cells[SORT_COLUMN_INDEX]);
    if (aa.length == 10)
	{
        dt1 = aa.substr(6,4)+aa.substr(3,2)+aa.substr(0,2);
    }
	else
	{
        yr = aa.substr(6,2);
        if (parseInt(yr) < 50)
		{
			yr = '20'+yr;
		}
		else
		{ 
			yr = '19'+yr;
		}
        dt1 = yr+aa.substr(3,2)+aa.substr(0,2);
    }
    if (bb.length == 10) 
	{
        dt2 = bb.substr(6,4)+bb.substr(3,2)+bb.substr(0,2);
    } 
	else
	{
        yr = bb.substr(6,2);
        if (parseInt(yr) < 50)
		{ 
			yr = '20'+yr;
		}
		else
		{
			yr = '19'+yr;
		}
        dt2 = yr+bb.substr(3,2)+bb.substr(0,2);
    }
    if (dt1==dt2) return 0;
    if (dt1<dt2) return -1;
    return 1;
}

function ts_sort_currency(a,b)
{ 
    aa = ts_getInnerText(a.cells[SORT_COLUMN_INDEX]).replace(/[^0-9.]/g,'');
    bb = ts_getInnerText(b.cells[SORT_COLUMN_INDEX]).replace(/[^0-9.]/g,'');
    return parseFloat(aa) - parseFloat(bb);
}

function ts_sort_numeric(a,b)
{ 
    aa = parseFloat(ts_getInnerText(a.cells[SORT_COLUMN_INDEX]));
    if (isNaN(aa))
		aa = 0;
    bb = parseFloat(ts_getInnerText(b.cells[SORT_COLUMN_INDEX])); 
    if (isNaN(bb))
		bb = 0;
    return aa-bb;
}

function ts_sort_caseinsensitive(a,b)
{
    aa = ts_getInnerText(a.cells[SORT_COLUMN_INDEX]).toLowerCase();
    bb = ts_getInnerText(b.cells[SORT_COLUMN_INDEX]).toLowerCase();
    if (aa==bb)
		return 0;
    if (aa<bb)
		return -1;
    return 1;
}

function ts_sort_default(a,b)
{
    aa = ts_getInnerText(a.cells[SORT_COLUMN_INDEX]);
    bb = ts_getInnerText(b.cells[SORT_COLUMN_INDEX]);
    if (aa==bb)
		return 0;
    if (aa<bb)
		return -1;
    return 1;
}


function addEvent(elm, evType, fn, useCapture)
// addEvent and removeEvent
// cross-browser event handling for IE5+,  NS6 and Mozilla
// By Scott Andrew
{
	if (elm.addEventListener)
	{
    	elm.addEventListener(evType, fn, useCapture);
	    return true;
	}
	else if (elm.attachEvent)
	{
	    var r = elm.attachEvent("on"+evType, fn);
	    return r;
	}
	else
	{
	    alert("Handler could not be removed");
	}
}