addEvent(window, "load", init);

function getObject(sObjId) {
	if (document.layers)
		return document.layers[sObjId];
	else if (document.all)
		return document.all[sObjId];
	else if (document.getElementById)
		return document.getElementById(sObjId);
}

function addEvent(elm, evType, fn, useCapture) {
	if (elm.addEventListener) {
		elm.addEventListener(evType, fn, useCapture);
		return true;
	} else if (elm.attachEvent)
		return elm.attachEvent("on"+evType, fn);
	else	alert("Handler could not be removed");
}

function addCSSClass(oElem, sClassName) {
	oElem.className = (oElem.className + " " + sClassName).trim();
}

function removeCSSClass(oElem, sClassName) {
	oElem.className = oElem.className.replace(sClassName, "").trim();
}

String.prototype.trim = function() {
	return this.replace(/^\s+|\s+$/, "");
}

function stripe(table_id) {
	var oElem = getObject(table_id);
	if (!oElem)
		return;
	var oRows = oElem.getElementsByTagName('tr');
	for (var i=1; i<oRows.length; i++) {
		removeCSSClass(oRows[i], 'alt');
		if (i%2 == 0)
			addCSSClass(oRows[i], 'alt');
	}
}

//   * Use a sortval="val" attribute in TD tags to override sorting by
//     the cell contents.
//   * Use sortsuppress="1" attribute in the column header to suppress
//     sorting by that column.

function init() {
	if (!document.getElementsByTagName)
		return;
	tbls = document.getElementsByTagName("table");
	for (var i=0; i<tbls.length; i++) {
		thisTbl = tbls[i];
		if (thisTbl.id) {
			ts_makeSortable(thisTbl);
			stripe(thisTbl.id);
		}
	}
}

function ts_makeSortable(table) {
	if (table.rows && table.rows.length > 0)
		var firstRow = table.rows[0];
	if (!firstRow)
		return;
	for (var i=0; i<firstRow.cells.length; i++) {
		var cell = firstRow.cells[i];
		if (cell.className.indexOf('sortsuppress') != -1)
			continue;
		var str = self.location+"";
		if (str.charAt(str.length-1) == '#')
			str = str.substring(0,str.length-1);
		cell.innerHTML = '<a href="'+str+'#" class="sortheader" onclick="ts_resortTable(this)">'+cell.innerHTML+'<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 cs = el.childNodes;
	var str = "";
	for (var i=0; i<cs.length; 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) {
	var span;
	for (var i=0; i<lnk.childNodes.length; i++) {
		if (lnk.childNodes[i].tagName && lnk.childNodes[i].tagName.toLowerCase() == 'span')
			span = lnk.childNodes[i];
	}
	var spantext = ts_getInnerText(span);
	var td = lnk.parentNode;
	var column = td.cellIndex;
	var table = getParent(td, 'TABLE');
	var row_count = 0;
	var test_row = 1;
	var sortval = table.rows[test_row].cells[column].getAttribute('sortval');

	// Work out a type for the column
	if (table.rows.length <= 1)
		return;
	for (var i=1; i<table.rows.length; i++) {
		if (table.rows[i].id.indexOf('section_row') == -1) {
			test_row = i;
			break;
		}
	}

	if (typeof(sortval) != 'undefined' && sortval)
		sortfn = ts_sort_sortval;
	else {
		var itm = ts_getInnerText(table.rows[test_row].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 (var i=0; i<table.rows[0].length; i++) { 
		firstRow[i] = table.rows[0][i];
	}
	for (var i=1; i<table.rows.length; i++) { 
	// We don't sort section/folder rows, so we skip them here:
		if (table.rows[i].id.indexOf("section_row") == -1) {
			newRows[row_count] = table.rows[i];
			row_count++;
		}
	}

	newRows.sort(sortfn);

	if (span.getAttribute("sortdir") == 'down') {
		ARROW = '&nbsp;&uarr;';
		newRows.reverse();
		span.setAttribute('sortdir', 'up');
	} else {
		ARROW = '&nbsp;&darr;';
		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 (var 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 (var 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;
	stripe(table.id);
}

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]));
	bb = parseFloat(ts_getInnerText(b.cells[SORT_COLUMN_INDEX]));
	if (isNaN(aa))	aa = 0;
	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 == '')	return 1;
	if (bb == '')	return -1;
	if (aa < bb)	return -1;
	return 1;
}

function ts_sort_sortval(a,b) {
	aa = a.cells[SORT_COLUMN_INDEX].getAttribute('sortval');
	bb = b.cells[SORT_COLUMN_INDEX].getAttribute('sortval');
	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;
}
*/