window.onload = function () {
    var container = $('div.sliderGallery');
    var ul = $('ul', container);
    var itemsWidth = ul.innerWidth() - container.outerWidth();
    
    $('.slider', container).slider({
        min: 15,
        max: itemsWidth,
        handle: '.handle',
        stop: function (event, ui) {
            ul.animate({'left' : ui.value * -1}, 555);
        },
        slide: function (event, ui) {
            ul.css('left', ui.value * -1);
        }
    });

};