$(document).ready(function(){
    lastBlock = $("#a1");
    maxWidth = 778;
    minWidth = 41;	

    $("#accordion ul li div.aprimi").click(
      function(){
        $(lastBlock).animate({width: minWidth+"px"}, { queue:false, duration:600 });
	$(this).animate({width: maxWidth+"px"}, { queue:false, duration:600});
	lastBlock = this;
      }
    );
});