$(document).ready(function(){
	var position, newPosition;
	position = 0;
	
	$("#menu ul li").css({top: position+"px"});
	
	$("#menu-top a").click(function(){
		if(position == -142){ position = -142; }
		else { position = position-71; }
		$("#menu ul li").animate( { top: position+"px" }, 500 );
	});
	
	$("#menu-bottom a").click(function(){
		if(position == 0){ position = 0; }
		else { position = position+71; }
		$("#menu ul li").animate( { top: position+"px" }, 500 );
	});
});