function init()
    {
  NormalOver = new Image();
  NormalOver.src = "./images/nav_normal_over.gif";
  NormalNormal = new Image();
  NormalNormal.src = "./images/nav_normal_normal.gif";
  NormalActive = new Image();
  NormalActive.src = "./images/nav_normal_active.gif";
  HeadActive = new Image();
  HeadActive.src = "./images/nav_head_active.gif";
  
  var Centerhoehe = document.getElementById("Center").offsetHeight;
  Centerhoehe = Centerhoehe + 160;
  /* var NormalOver = new Image();
  NormalOver.src = "./images/nav_normal_over.gif";
  var NormalOver = new Image();
  NormalOver.src = "./images/nav_normal_over.gif"; */
  var Fensterhoehe;
  if (self.innerHeight) // all except Explorer
  {
  	Fensterhoehe = self.innerHeight;
  }
  else if (document.documentElement && document.documentElement.clientHeight)
  	// Explorer 6 Strict Mode
  {
  	Fensterhoehe = document.documentElement.clientHeight;
  }
  else if (document.body) // other Explorers
  {
  	Fensterhoehe = document.body.clientHeight;
  }
  
  Fensterhoehe = Fensterhoehe -1;
  
  document.getElementById("Content").style.height = ((Fensterhoehe > Centerhoehe) ? Fensterhoehe : Centerhoehe) + "px";
  //alert(Fensterhoehe);
  //alert(Centerhoehe);
}

function getCookieVal (offset)
{
  var endstr = document.cookie.indexOf (";", offset);
  if (endstr == -1)
      endstr = document.cookie.length;
  return unescape(document.cookie.substring(offset, endstr));
}

function GetCookie (name)
{
  var arg = name + "=";
  var alen = arg.length;
  var clen = document.cookie.length;
  var i = 0;
  while (i < clen)
  {
      var j = i + alen;
      /* alert(document.cookie.substring(i, j)); */
      if (document.cookie.substring(i, j) == arg)
      return getCookieVal (j);
      i = document.cookie.indexOf(" ", i) + 1;
      if (i == 0) break; 
  }
  return null;
}

function setNormalOver(id)
{
  NavImg = document.getElementById("normal_" + id);
  
  if ( NavImg.src != NormalActive.src )
  {
    NavImg.src = NormalOver.src;
  }
}

function setNormalNormal(id)
{
  NavImg = document.getElementById("normal_" + id);
  
  if ( NavImg.src != NormalActive.src )
  {
    NavImg.src = NormalNormal.src;
  }
}

function setActive(head_id, normal_id)
{
  if (document.cookie)
  {
    document.cookie = "";
  }
  
  document.cookie = "head=" + head_id;
  document.cookie = "normal=" + normal_id;
}

function getActive()
{
  var normal_id = GetCookie("normal");
  var head_id = GetCookie("head");
  /* alert(normal_id); */
  HeadImg = document.getElementById("head_" + head_id);
  HeadImg.src = HeadActive.src;
  
  if ( normal_id )
  {
    NormalImg = document.getElementById("normal_" + normal_id);
    NormalImg.src = NormalActive.src;
  }
}