(function(){
var AsyncUrlUtils = new Object();
AsyncUrlUtils.loadUrl = function(src, redirect) {
	function callCountDown() {
		AsyncUrlUtils.countDown(redirect);
	}
	var img = document.createElement("img");
	img.onload = callCountDown;
	img.onerror = callCountDown;
	img.onabort = callCountDown;
	img.src = src;
}
AsyncUrlUtils.initCounter = function(initValue) {
	this.imgCounter = initValue;
}
AsyncUrlUtils.countDown = function(redirect) {
	this.imgCounter--;
	if (0 == this.imgCounter) {
		redirect();
	}
}
	function successHandler(){
		callback({"code":200,"data":{}});
	}

	var asyncUrls = [];
	
	if (asyncUrls.length == 0) {
		successHandler();
		return;
	}

	setTimeout(successHandler, 500);
	AsyncUrlUtils.initCounter(asyncUrls.length);

	for (var i in asyncUrls) {
		AsyncUrlUtils.loadUrl(asyncUrls[i], successHandler);
	}
})();