function preloadImage(imgObj,imgSrc) {
	/*
		function to preload images
	*/
	if (document.images) {
		eval(imgObj+' = new Image()');
		eval(imgObj+'.src = "'+imgSrc+'"');
	}
}

function changeImage(imgName,imgObj,layer) {
	/*
		function to do rollovers of images
	*/
	if (document.images) {
		if (document.layers) {
			if (layer!=null){
				eval('document.layers.'+layer+'.document.images["'+imgName+'"].src = '+imgObj+'.src');
			} else {
				document.images[imgName].src = eval(imgObj+".src");
			}
		} else {
			document.images[imgName].src = eval(imgObj+".src");
		}
	}
}