(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 (i = 0; i < imgArr.length; i++) {
				imgList.push($("<img/>").load(function() { loaded++; setting.loaded(this, loaded, total); if(loaded == total) { setting.loaded_all(loaded, total,imgArr); } }).attr("src", imgArr[i]) );
			}
			
		}
	});
})(jQuery);