function twoframes(URI1,F1,URI2,F2) {
  Frame1=eval("parent."+F1);
  Frame2=eval("parent."+F2);
  Frame1.location.href = URI1;
  Frame2.location.href = URI2;
}
function twoframesBack(F1,F2) {
  Frame1=eval("parent."+F1);
  Frame2=eval("parent."+F2);
  Frame1.history.back();
  if (!window.opera) window.setTimeout("Frame2.history.back()",10);
}
function twoframesForward(F1,F2) {
  Frame1=eval("parent."+F1);
  Frame2=eval("parent."+F2);
  Frame1.history.forward();
  if (!window.opera) window.setTimeout("Frame2.history.forward()",10);
}

var counter = 1;
function bildwechsel() {
if(counter <= 3) {
document.images.bild.src = "pix/topl_navi/top" + counter + ".jpg";
counter++;
setTimeout("bildwechsel()", 5500);
} else { 
counter = 1; 
setTimeout("bildwechsel()", 0); 
}
}

function checkFrameset() {
  if(!parent.navi)
   location.href="index.php";
 }