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//    images preload function
//    $.preloadImages(images, function () {
//    });

$.preloadImages = function () {

    if (typeof arguments[arguments.length - 1] == 'function') {
        var callback = arguments[arguments.length - 1];
    } else {
        var callback = false;
    }

    if (typeof arguments[0] == 'object') {
        var images = arguments[0];
        var n = images.length;
    } else {
        var images = arguments;
        var n = images.length - 1;
    }
    var not_loaded = n;
    for (var i = 0; i < n; i++) {
        jQuery(new Image()).attr('src', images[i]).load(function() {
            if (--not_loaded < 1 && typeof callback == 'function') {
                callback();
            }
        });
    }
}