function changeMenu() {
    var sender = $(this);

    var currentImage = sender.attr("src");
    var originalImage = sender.parent().attr("rel");

    sender.parent().attr("rel", currentImage);

    if (sender.attr("isClicked") != undefined)
        sender.attr("src", sender.attr("switchImage"));
    else
        sender.attr("src", originalImage);
      }

      function setMenu(id)
      {
      	var source = $("#" + id);
      	var exchangeImage = source.parent().attr("rel");
      	source.attr("src", exchangeImage);
      }
      $(function()
      {
      	$(".nav img").bind("mouseover", changeMenu);
      	$(".nav img").bind("mouseout", changeMenu);

      	$(".nav>ul>li").hover(function() { $(this).children("ul").show(); }, function() { $(this).children("ul").hide(); });
      	$(".nav2>ul>li").hover(function() { $(this).children("ul").show(); }, function() { $(this).children("ul").hide(); });
      });