function cb_on(id)
{
  if(document.getElementById)
  {
  document.getElementById(id+"1").style.backgroundColor="#ffffff";
  document.getElementById(id+"2").style.backgroundColor="#ffffff";
  document.getElementById(id+"3").style.backgroundColor="#ffffff";
  document.getElementById(id+"4").src="pics/grafik/navi_pfeil_a.gif";
  }

}

function cb_out(id)
{
  if(document.getElementById)
  {
  document.getElementById(id+"1").style.backgroundColor="#ffffcc";
  document.getElementById(id+"2").style.backgroundColor="#ffffcc";
  document.getElementById(id+"3").style.backgroundColor="#ffffcc";
  document.getElementById(id+"4").src="pics/grafik/navi_pfeil_0.gif";
  }

}