$(document).ready(function() {
	var navDuration = 150; //time in miliseconds
	var navJumpHeight = "6px";

	$('#nav li').hover(function() {
		$(this).animate({ top : "-="+navJumpHeight }, navDuration);            
		}, function() {
			$(this).animate({ top : "0" }, navDuration);
	});
});//doc ready