(function(){
	document.write("<img src='img/dog.jpg' width='300'/>");

	function addEvent(element, evnt, funct) {
		if (element.attachEvent) {
			return element.attachEvent('on'+evnt, funct);
		} else {
			return element.addEventListener(evnt, funct, false);
		}
	}

	function loadScript(url, callback){

		var script = document.createElement("script")
		script.type = "text/javascript";

		if (script.readyState){  //IE
			script.onreadystatechange = function(){
				if (script.readyState == "loaded" ||
						script.readyState == "complete"){
					script.onreadystatechange = null;
					callback();
				}
			};
		} else {  //Others
			script.onload = function(){
				callback();
			};
		}

		script.src = url;
		document.body.appendChild(script);
	}

	addEvent(window, 'load', function(){
		var url1 = "js1.js";
		var url2 = "js2.js?r=" + Math.random();

		loadScript( url1, function(){
			loadScript( url2, function(){
				alert(x);
			});
		});
/*
		loadScript( url1, function(){
		});
		loadScript( url2, function(){
			alert(x);
		});
*/

	});
}());