$(document).ready(function() {
    /*lastBlock = $(".FitstItemInAccordion");*/
    lastBlock = $("ul.Accordion li:first-child");
    maxWidth = 443;
    minWidth = 30;

    $("ul.Accordion li").click(
      function() {
          $(lastBlock).animate({ width: minWidth + "px" }, { queue: false, duration: 400 });
          $(lastBlock).children("div").css("display", "none");
          
          $(this).animate({ width: maxWidth + "px" }, { queue: false, duration: 400 });
          $(this).children("div").css("display", "block");
          lastBlock = this;
      }
    );
});