function mouseover(buttonname)
{
  eval("image=document."+buttonname);
  if (image!=null)
  {
    eval("image.src="+buttonname+"_fokus.src");
  }
}

function mouseout(buttonname)
{
  eval("image=document."+buttonname);
  if (image!=null)
  {
    eval("image.src='"+baseurl+buttonname+".jpg'");
  }
}

function mousedown(buttonname)
{
  eval("image=document."+buttonname);
  if (image!=null)
  {
    eval("image.src="+buttonname+"_down.src");
  }
}

function mouseup(buttonname)
{
  eval("image=document."+buttonname);
  if (image!=null)
  {
    eval("image.src="+buttonname+"_fokus.src");
  }
}