var tp;
$(document).ready(function () {
var offset=$("div.promo_menu_inner").offset();
tp=offset.top;
$("div.promo_menu_inner").css("position","absolute");
if (gettop()>0) tp=tp-gettop();
$(window).scroll(function () { 
if (parseInt(gettop())>parseInt(tp)){
$("div.promo_menu_inner").css({ position: "fixed", top: "0" });
}else{
$("div.promo_menu_inner").css({ position: "absolute", top: tp });
}
});
});
function gettop(){
	var t=0;
	if (document.documentElement) {
		t = document.documentElement.scrollTop;
	} else if (document.body) {
		t = document.body.scrollTop;
	}
	if (typeof pageYOffset != 'undefined') {
		t = pageYOffset;
	}
	return t;
}