$(document).ready(function(){
 
  activeItem2 = $("#accordion2 li a:first");
  $(activeItem2).addClass('active');
 
  $("#accordion2 li a").click(function(){
      $(activeItem2).animate({width: "40px"}, {duration:500, queue:false});
      $(this).animate({width: "765px"}, {duration:500, queue:false});
      activeItem2 = this;
  });
 
});