$(document).ready(function(){
		    lastBlock = $("#a1");
		    maxWidth = 200;
		    minWidth = 75;	
		
		    $("ul li a").hover(
		      function(){
		        $(lastBlock).animate({width: minWidth+"px"}, { queue:false, duration:400 });
			$(this).animate({width: maxWidth+"px"}, { queue:false, duration:400});
			lastBlock = this;
		      }
		    );
		});