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

function change(name,quelle){

  window.status = "";
  document.images[name].src = quelle;
}