window.onload = function() {
    var image_selector = document.getElementById('gallery_imageselector');
    if (image_selector && location.hash) {
        var current = document.getElementById('preview' + location.hash.substr(4));
        //alert(current.offsetLeft + ' ' + current.width);
        image_selector.scrollLeft = current.offsetLeft - image_selector.offsetWidth / 2 + current.width / 2;
    }
}