function onScrollInit( items, trigger ) {
    items.each( function() {
        var osElement = $(this),
            osAnimationClass = osElement.attr('data-animation');
        var osTrigger = ( trigger ) ? trigger : osElement;
        osElement.removeClass(osAnimationClass).css("visibility","hidden");
        osTrigger.waypoint(function(direction) {
            if(direction=='down'){
                osElement.addClass(osAnimationClass).css("visibility","visible");
            }else{
                osElement.removeClass(osAnimationClass).css("visibility","hidden");
            }
        },{
            triggerOnce: true,
            offset: '100%'
        });
    });
}
onScrollInit( $('.scroll_response') );