//	Cache images for quick swapping
	function preLoad()
	{
		if (!bw.img) return;
		var ar = new Array();
		for (var i = 0; i < arguments.length; i++)
		{
			ar[i] = new Image();
			ar[i].src = arguments[i];
		}
	}
		
//	Swap images 
	function swapImages(imgName, imgSource) { if (bw.img) document.images[imgName].src = imgSource; }
		
//	Swap images that are nested in Layers
	function swapImage(imgName, imgSource, layerOne, layerTwo) { if (bw.img) getImgObj(imgName, layerOne, layerTwo).src = imgSource; }
	
//  Get the image object given imageid/name and the layers the image sits in - for two layers.
	function getImgObj(imgId, layer1, layer2)
	{
		if (bw.dom) menuImgObj = eval ("document.getElementById('" + imgId + "')");
		else if ((bw.ie4) || (bw.ie5)) menuImgObj = eval ("document.all." + layer2 + ".document.images['" + imgId + "']");
		else if (bw.ns4) menuImgObj = eval ("document.layers." + layer1 + ".document.layers." + layer2 + ".document.images['" + imgId + "']");
		return menuImgObj;
	}
	
//	Keep active state
	function swapActiveImg(num)
	{
		var menuImgId = "imgFold" + num;
		var menuLayer = "divFold" + num;
		var menuImgSrc = getImgObj(menuImgId, "idSideNavigation", menuLayer).src;
		
		menuImgSrc = menuImgSrc.substring(menuImgSrc.indexOf('/p'), menuImgSrc.length);
		if (menuImgSrc.indexOf('-') > 0) menuImgSrc = menuImgSrc.substring(0, menuImgSrc.indexOf('-'));
		else if (menuImgSrc.indexOf('.') > 0) menuImgSrc = menuImgSrc.substring(0, menuImgSrc.indexOf('.')); //to take care of menu opening on page load - menuImgSrc won't contain a -
		menuImg = menuImgSrc + ".gif";
		menuImgOver = menuImgSrc + "-o.gif";
		menuImgActive = menuImgSrc + "-a.gif";
			
		if (oFold[num].sub[0].status) // to test if the menu is being opened.
		{
			if (prevImgId != "")
			{
				swapImage(prevImgId, prevImgSrc, 'idSideNavigation', prevImgLayer);
				swapImage(menuImgId, menuImgActive, 'idSideNavigation', menuLayer);
				prevImgId = menuImgId;
				prevImgSrc = menuImg;
				prevImgLayer = menuLayer;
			}
			else
			{
				swapImage(menuImgId, menuImgActive, 'idSideNavigation', menuLayer);
				prevImgId = menuImgId;
				prevImgSrc = menuImg;
				prevImgLayer = menuLayer;
			}
		}
		else swapImage(menuImgId, menuImg, 'idSideNavigation', menuLayer);
	}
	
	function activeMouseOut(num) // this function is used for mouseouts on top level menus just in case we want to change functionality at a later date
	{
		if (oFold[num].sub[0].status) swapActiveImg(num);
		else swapActiveImg(num);
	}