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