(function(){

    
    var navbar =  document.querySelector('.navbar');
    var main_wrapper = document.querySelector('.main-wrapper');
    var main_container = document.querySelector('.main-container');
    var skin_enabled = (document.querySelector('html').className.indexOf('skin-enabled') != -1);
    var skin_offset = false;

    if(skin_enabled)
        UI.scroller.actionStack.push((function(){

            if(UI.scroller.viewPortPosition > 90 && !skin_offset) {
                navbar.classList.add("scroll-offset");
                main_wrapper.classList.add("scroll-offset");
                main_container.classList.add("scroll-offset");
                skin_offset = true;
            } 

            if(UI.scroller.viewPortPosition <= 90 && skin_offset) {    
                navbar.classList.remove("scroll-offset");
                main_wrapper.classList.remove("scroll-offset");
                main_container.classList.remove("scroll-offset");
                skin_offset = false;
            }

        }).bind(this));

})();