function add_stretch_js() {
    var items_width = $('.canvas .content .items').width();
    $('.canvas .content').css('width', items_width+'px');
    $('.canvas').css('width', items_width+180+20+'px');
    
    $scrollable = $(window)._scrollable();
    
    $(document).mousewheel(function(event, delta) {
        if (delta > 0) {
           //console.log('up'); 
           $scrollable.scrollTo('-=50px', {axis: 'x'});
        } else if (delta < 0) {
            //console.log('down');
            $scrollable.scrollTo('+=50px', {axis: 'x'});
        }
        
        return false;
    });
}