var deferred = self.element.find("img").map(function(index, image) {
    var $def = $.Deferred(),
        $image = $(image),
        img = new Image(),
        url = $image.attr('data-url');
    $(img).load(function() {
        $image.attr('src', url);
        $def.resolve;
    }).attr('src', url);
    return $def.promise();
});

$.when.apply(deferred).done(function() {
    callback();
});