gistfile1.js

// Add callback support to Asset.css for all browsers
Asset.css = function(source, onLoad) {
	var link = new Element('link', { rel: 'stylesheet', media: 'screen', type: 'text/css', href: source });

	if (("onload" in link) && !Browser.Engines.webkit()) {
		if (onLoad) link.onload = onLoad;
	} else {
		(function() {
			try {
				link.sheet.cssRules;
			} catch (e) {
				setTimeout(arguments.callee, 100);
				return;
			};
			if (onLoad) onLoad();
		})();
	}

	link.inject(document.head);
	return link;
}