function preload() {
	if (!document.images) return;
	var ar = new Array();
	var args = preload.arguments;
	for (var i = 0; i < args.length; ++i) {
		ar[i] = new Image();
		ar[i].src = args[i];
	}
}

function change(id, src) {
	var elem = document.getElementById(id);

	if (elem != null) {
		elem.src = src;
	}
}