Async JS Loading and Asset Preloading Snippets .js

(function(d, isIE) {
var s = d.getElementsByTagName('script')[0];
function async(url) {
	var scr = [];
	for (u in url) {
		var j = scr[scr.length] = d.createElement('script');
		j.type = 'text/javascript'; j.async = true;
		j.src = url[u];
		s.parentNode.insertBefore(j, s);		
	}
	return scr;
}
async([
	"http://ajax.googleapis.com/ajax/libs/jquery/1.4/jquery.min.js",
	"/js/films.js"
]);
if (isIE) { async(["http://html5shiv.googlecode.com/svn/trunk/html5.js"]); }
function preload(preload) {
	var i = 0;
	var	max = 0;
	var o = null;
	for (i = 0, max = preload.length; i < max; i += 1) {
		if (isIE) {
			new Image().src = preload[i];
			continue;
		}
		o = d.createElement('object');
		o.data = preload[i];
		o.width  = 0;
		o.height = 0;
		d.body.appendChild(o);
	}
}
// list of stuff to preload
preload(["/img/warning.png"]);
}(document, navigator.appName.indexOf('Microsoft') === 0));