var selected = "home";

  var marker_on  = new Image();
  var marker_off = new Image();
  marker_on.src  = "../pics/buttons/marker.gif";
  marker_off.src = "../pics/buttons/empty.gif";

  
function turnon(bar)  {
   document ["marker_"+bar].src = marker_on.src;
}

function turnoff(bar)   {
   document ["marker_"+bar].src  = marker_off.src;
   document ["marker_"+selected].src = marker_on.src;
}

function jump(bar) {

   document ["marker_home"].src = marker_off.src;
   document ["marker_biographie"].src = marker_off.src;
   document ["marker_bibliographie"].src = marker_off.src;
   document ["marker_events"].src = marker_off.src;
   document ["marker_news"].src = marker_off.src;
   document ["marker_texte"].src = marker_off.src;
   document ["marker_multimedia"].src = marker_off.src;
   document ["marker_bilder"].src = marker_off.src;
   document ["marker_aas"].src = marker_off.src;
   document ["marker_links"].src = marker_off.src;

   selected = bar;
   document ["marker_"+selected].src = marker_on.src;

}