function imagePreload(id, source) {
	if (document.images) {
		eval(id + " = new Image();");
		eval(id + ".src = '" + source + "';");
	}
}

function imageRollover(el, id) {
	if (document.getElementById(el)) {
		eval("document.getElementById(el).src = " + id + ".src;");
	}
}