function openPop(destination,winname,scroll,winwidth,winheight) {
  satellite =  window.open(destination,winname,"locationbar=no,directories=no,status=no,menubar=no,resizable=no,scrollbars="+scroll+",copyhistory=no,width="+winwidth+",height="+winheight+"");
  satellite.moveTo(((screen.width/2)-(winwidth/2)),((screen.height/2)-(winheight/2)));
}


function change(name,quelle){
  window.status = "";
  document.images[name].src = quelle;
}