window.onload = function () {
	if (!document.getElementsByTagName) return false;
}
//If the browser is W3 DOM compliant, execute setImageSwaps function
if (document.getElementsByTagName && document.getElementById) {
if (window.addEventListener) window.addEventListener('load', setImageSwaps, false);
else if (window.attachEvent) window.attachEvent('onload', setImageSwaps);
}

//When document loads, apply the prepareImageSwap function to various images with our desired settings
function setImageSwaps() {
//Mousedown, restore - for images in container with ID=example2
//prepareImageSwap('example2',true,true,true,true);
//Hover, mousedown, no restore - for images in container with ID=example3
//prepareImageSwap('example3',true,false,true,false);
//Hover with restore, most basic usage - for any image in document.body that are not yet processed (function accepts elements,too)
prepareImageSwap(document.body);
//Note that once an image is processed, it won't be processed again, so you should set more specific images first, e.g. document.body, as it is the grand
//container, has to be processed last.
}
//
function prepareImageSwap(elem,mouseOver,mouseOutRestore,mouseDown,mouseUpRestore,mouseOut,mouseUp) { 
//Non-Obtrusive Image Swap Script V1.1 by Hesido.com 
if (typeof(elem) == 'string') elem = document.getElementById(elem);
	if (elem == null) return;
	var regg = /(.*)(_nm\.)([^\.]{3,4})$/
	var prel = new Array(), img, imgList, imgsrc, mtchd;
	imgList = elem.getElementsByTagName('img');

	for (var i=0; img = imgList[i]; i++) {
		if (!img.rolloverSet && img.src.match(regg)) {
			mtchd = img.src.match(regg);
			img.hoverSRC = mtchd[1]+'_hv.'+ mtchd[3];
			img.outSRC = img.src;
			if (typeof(mouseOver) != 'undefined') {
				img.hoverSRC = (mouseOver) ? mtchd[1]+'_hv.'+ mtchd[3] : false;
				img.outSRC = (mouseOut) ? mtchd[1]+'_ou.'+ mtchd[3] : (mouseOver && mouseOutRestore) ? img.src : false;
				img.mdownSRC = (mouseDown) ? mtchd[1]+'_md.' + mtchd[3] : false;
				img.mupSRC = (mouseUp) ? mtchd[1]+'_mu.' + mtchd[3] : (mouseOver && mouseDown && mouseUpRestore) ? img.hoverSRC : (mouseDown && mouseUpRestore) ? img.src : false;
				}
			if (img.hoverSRC) {preLoadImg(img.hoverSRC); img.onmouseover = imgHoverSwap;}
			if (img.outSRC) {preLoadImg(img.outSRC); img.onmouseout = imgOutSwap;}
			if (img.mdownSRC) {preLoadImg(img.mdownSRC); img.onmousedown = imgMouseDownSwap;}
			if (img.mupSRC) {preLoadImg(img.mupSRC); img.onmouseup = imgMouseUpSwap;}
			img.rolloverSet = true;
		}
	}

	function preLoadImg(imgSrc) {
		prel[prel.length] = new Image(); prel[prel.length-1].src = imgSrc;
	}

}
//
function imgHoverSwap() {this.src = this.hoverSRC;}
function imgOutSwap() {this.src = this.outSRC;}
function imgMouseDownSwap() {this.src = this.mdownSRC;}
function imgMouseUpSwap() {this.src = this.mupSRC;}
//
function hideLayer(whichLayer) {
	if (whichLayer == 'dropNav' && document.getElementById('moreNav')) {
		document.getElementById('moreNav').style.color = 'rgb(139,155,146)';
	}	
	if (document.getElementById) {
// standards
		document.getElementById(whichLayer).style.visibility = "hidden";
	}
	else if (document.all) {
// old msie versions
	document.all[whichlayer].style.visibility = "hidden";
	}
	else if (document.layers) {
// nn4
	document.layers[whichLayer].visibility = "hidden";
	}
}
//
function hideAll() {
	hideLayer();
	hideLayer();
	hideLayer();
	hideLayer();
	hideLayer();
}

function showLayer(whichLayer) {
	if (whichLayer == 'dropNav' && document.getElementById('moreNav')) {
		document.getElementById('moreNav').style.color = 'rgb(255,196,12)';
	}	
	if (document.getElementById) {
// standards
		document.getElementById(whichLayer).style.visibility = "visible";
	}
	else if (document.all) {
// old msie versions
		document.all[whichlayer].style.visibility = "visible";
	}
	else if (document.layers) {
// nn4
		document.layers[whichLayer].visibility = "visible";
	}
}
//
var timerID = null;
var timerOn = false;
var timecount = 500;
//
function startTime() {
	if (timerOn == false) {
		timerID = setTimeout('hideLayer(\'dropNav\')', timecount);
		timerOn = true;
	}
}
//
function stopTime() {
	if (timerOn) {
		clearTimeout(timerID);
		timerID = null;
		timerOn = false;
	}
}
function swapChart(newImg) {
	var target = document.getElementById("chart");
	target.src = "../images/charts/" + newImg;
}