var promotion = $('promotion');
if (window.attachEvent) {
	window.attachEvent("onscroll", function() {
		promotion.set('styles' ,{
			'top' : $(document.body).getScroll().y + 100
		});
	});
} else if (document.addEventListener) {
	document.addEventListener("scroll",  function() {
		promotion.set('styles' ,{
			'top' : $(document.body).getScroll().y + 100
		});
	}, false);
}