$(document).ready(function() {
	var name = "#nav";
	var menuYloc = null;

	menuYloc = parseInt($(name).css("top").substring(0, $(name).css("top").indexOf("px")));
	$(window).scroll(function() {
		if ($(window).height() > 455) {
			offset = menuYloc + $(document).scrollTop() + "px";
			$(name).animate({ top: offset }, { duration: 500, queue: false });
		}
	});
});