function openNewWindow(myURL,myName,myParams) {
  oben=((screen.availHeight-600-29)/2);
  seite=((screen.availWidth-800-10)/2);
  myParams= myParams +",top="+oben+", left="+seite;
  var theWindow = window.open(myURL, myName, myParams);
  if (theWindow)	{theWindow.focus();}
  }