function hideDivs(exempt)
  {
    if (!document.getElementsByTagName) return null;
    if (!exempt) exempt = "";
    var divs = document.getElementsByTagName("div");
    for(var i=0; i < divs.length; i++)
    {
      var div = divs[i];
      var id = div.id;
      if ((id != "header") &&
          (id != "footer") &&
          (id != exempt) &&
          (id.indexOf("aa") != -1))
      {
        div.className = "hidden";
      }
    }
  }
  
  function fixLinks()
  {
    if (!document.getElementsByTagName) return null;
    var anchors = document.getElementsByTagName("a");
    for(var i=0; i < anchors.length; i++)
    {
      var a = anchors[i];
      var href = a.href;
      if ((href.indexOf("#") != -1) &&
          (href.indexOf("header") == -1))
      {
        var index = href.indexOf("#") + 1;
        href = "javascript:show('" +
               href.substring(index) + "');";
        a.setAttribute("href",href);
      }
    }
  }
  
  function show(what)
  {
    if (!document.getElementById) return null;
    showWhat = document.getElementById(what);
    if(showWhat.className == "hidden") 
    {
       showWhat.className = "";
    }
    else
    {
      showWhat.className = "hidden";
    }
    //showWhat.className = "";
    //hideDivs(what);
  }
  
  window.onload = function()
  {
    hideDivs("intro");
    fixLinks();
  }