var _prefetch_urls = Array(
		"/static/images/head1_bg2.png",
		"/static/images/mainmenu_bg2.png"
		/* Don't put comma after the last array element, ie sux! */
);

function _prefetch(urls) {
	for ( var src in urls ) {
		var img = new Image();
		img.src = urls[src];
	}
}

_prefetch(_prefetch_urls);