Javascript loader for asynchronous and non-blocking loading of JS. Compare this to https://github.com/ded/script.js

jsloader

(function() {
	function getScript(url,success){
		var script=document.createElement('script');
		script.src=url;
		var head=document.getElementsByTagName('head')[0], done=false;
		script.onload=script.onreadystatechange = function(){
			if ( !done && (!this.readyState || this.readyState == 'loaded' || this.readyState == 'complete') ) {
				done=true;
				success();
				script.onload = script.onreadystatechange = null;
				head.removeChild(script);
			}
		};
		head.appendChild(script);
	}
	getScript('http://ajax.googleapis.com/ajax/libs/jquery/1.5.2/jquery.min.js',function(){
		// YOUR CODE GOES HERE AND IS EXECUTED AFTER JQUERY LOADS
	});
})();

// dependencies:
getScript('http://myurltojquery.js',function(){
	getScript('http://myurltojqueryUI.js',function(){
		// your code here
	})
});