Poor man's requirejs

loadLibs.js

  ; (function($, Raphael, window, document, undefined){
	
		function loadLibs(libs, callback) {
			
			function loadScripts(callback) {
				libs.forEach(function(lib){
					if (!lib.getLib()){
						console.log("loading " + lib.url);			
						var head = document.getElementsByTagName('head')[0];
						var script = document.createElement('script');
						script.type = 'text/javascript';	
						script.async = 'async';
						script.src = lib.url;			
						head.appendChild(script);
					}
				});	
				checkReady(callback);
			}
			
			function checkReady (callback) {		
				if (allLibsLoaded()){				
					callback();
				} else {				
					window.setTimeout(function() { checkReady(callback); }, 100);
				}
			};

			function allLibsLoaded(){
				for (var i = 0; i < libs.length; i++) {
					if (!libs[i].getLib()) return false; 					
				}
				return true;			
			}

			loadScripts(callback);	
			
		}
						
				
		loadLibs(
			[			
				{getLib: function(){return window.jQuery;}, url: "http://code.jquery.com/jquery-1.9.1.min.js"},
				{getLib: function(){return window.Raphael;}, url: "https://raw.github.com/DmitryBaranovskiy/raphael/master/raphael-min.js"}
			],
			function(){
				$ = window.jQuery.noConflict(); 
				Raphael = window.Raphael;
				
				console.log("jquery: " + $().jquery);
				console.log("Raphael: " + Raphael);
				$("#bla").html("everything is loaded! ");
			}
		);
			
	}(typeof jQuery != 'undefined' ? jQuery : undefined, typeof Raphael != 'undefined' ? Raphael : undefined, window, document));