function swap(layer,imgID,imgObj) {
	if (document.layers && layer!=null) eval('document.'+layer+'.document.images["'+imgID+'"].src = '+imgObj+'.src');
	else document.images[imgID].src = eval(imgObj+".src");
}

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