var lastScrollY = 0;

$(function(){
	
 var diffY = document.documentElement.scrollTop;

 $(window).scroll(function(){
	var diffTop = Math.max(document.documentElement.scrollTop, document.body.scrollTop) + 300;

	if (diffY != lastScrollY) {
	 percent = .10 * (diffY - lastScrollY);
	 if (percent > 0) {
		percent = Math.ceil(percent);
	 } else {
		percent = Math.floor(percent);
	 }
	 
	 diffTop = parseInt($("#quick_menu").offset().top) + percent;

	 lastScrollY = lastScrollY + percent;
	}
	
	$("#quick_menu").stop();

	$("#quick_menu").animate({"top": diffTop}, 500);
 });
});