(function($) {
	var imgList = [];
	$.extend({
		preload: function(imgArr, option) {
			var setting = $.extend({
				init: function(loaded, total) {},
				loaded: function(img, loaded, total) {},
				loaded_all: function(loaded, total) {}
			}, option);
			var total = imgArr.length;
			var loaded = 0;
			setting.init(0, total);
			for(var i in imgArr) {
				imgList[i] = $(document.createElement("img"));
				imgList[i].load(function() {
					loaded++;
					setting.loaded(this, loaded, total);
					
					if(loaded == total) {
						setting.loaded_all(loaded, total);
					}
				}).attr("src", imgArr[i]);
			}
		}
	});
})(jQuery);