$(document).ready(function(){
    lastBlock = $("#a1");
    maxWidth = 210;
    minWidth = 90;	

    $("#icon li div").click(
      function(){
        $(lastBlock).animate({width: minWidth+"px"}, { queue:false, duration:800 });
		$(this).animate({width: maxWidth+"px"}, { queue:false, duration:800});
		lastBlock = this;
      }
    );
});