$(document).ready(function(){//j'ouvre jquery

    lastBlock = $("#a1");
    maxHeight = 396;
    minHeight = 57;	

    $("ul li a").hover(
      function(){
        $(lastBlock).animate({height: minHeight+"px"}, { queue:false, duration:400 });
	$(this).animate({height: maxHeight+"px"}, { queue:false, duration:400});
	lastBlock = this;
      }
    );
	

    
	
	
});//je ferme jquery