$(document).ready(function(){
		lastBlock = $("#a1");
		maxWidth = 210;
		minWidth = 75; 	
	
		$("ul li div").hover( 
		  function(){
			$(lastBlock).animate({width: minWidth+"px"}, { queue:false, duration:400 });
		$(this).animate({width: maxWidth+"px"}, { queue:false, duration:400});
		lastBlock = this;
		  }
		);
	});