var hibut=0;
var imgll = new Image();
imgll.src = "bilder/buttonl.gif";
var imgrl = new Image();
imgrl.src = "bilder/buttonr.gif";
var imglh = new Image();
imglh.src = "bilder/buttonh.gif";
var imgrh = new Image();
imgrh.src = "bilder/buttonrh.gif";

function hi(bnr)
{
  if (document.getElementsByTagName)
  {
    if (document.getElementsByTagName('img')[bnr].name=='r')
      document.getElementsByTagName('img')[bnr].src=imgrh.src;
    else
      document.getElementsByTagName('img')[bnr].src=imglh.src;
  }
  else if (document.all)
    if (document.images[bnr].name=='r')
      document.images[bnr].src=imgrh.src;
    else
      document.images[bnr].src=imglh.src;
  else if (document.layers)
    if (document.layers[bnr].document.images[0].name=='r')
      document.layers[bnr].document.images[0].src=imgrh.src;
    else
      document.layers[bnr].document.images[0].src=imglh.src;
}
function lo(bnr)
{
  if (document.getElementsByTagName)
  {
    if (document.getElementsByTagName('img')[bnr].name=='r')
      document.getElementsByTagName('img')[bnr].src=imgrl.src;
    else
      document.getElementsByTagName('img')[bnr].src=imgll.src;
  }
  else if (document.all)
  {
    if (document.images[bnr].name=='r')
      document.images[bnr].src=imgrl.src;
    else
      document.images[bnr].src=imgll.src;
  }
  else if (document.layers)
    if (document.layers[bnr].document.images[0].name=='r')
      document.layers[bnr].document.images[0].src=imgrl.src;
    else
      document.layers[bnr].document.images[0].src=imgll.src;
}
function go(bnr)
{
  if (document.getElementsByTagName)
  {
    document.getElementsByTagName('img')[hibut].src=imgll.src;
    hibut=bnr;
    document.getElementsByTagName('img')[hibut].src=imglh.src;
  }
  else if (document.layers)
  {
    document.layers[hibut].document.images[0].src=imgll.src;
    hibut=bnr;
    document.layers[hibut].document.images[0].src=imglh.src;
  }
  else if (document.all)
  {
    //document.all[bnr].style.pixelLeft=20;
  }
}

function init(itemhi)
{
  if (itemhi>0)
  {
    hibut=itemhi-1;
    if (document.getElementsByTagName)
    {
      document.getElementsByTagName('img')[hibut].src=imglh.src;
    }
    else if (document.layers)
    {
      document.layers[hibut].document.images[0].src=imglh.src;
    }
    else if (document.all)
    {
      //document.all[bnr].style.pixelLeft=20;
    }

  }
}