function oeffnefenster(datei){
 fenster =window.open(datei,'erklarung','width=600,height=400,scrollbars=yes,resizable=yes');
 posx= screen.width-610;
 posy=60;
 fenster.moveTo(posx,posy);
 fenster.resizeTo(600,400);
 fenster.focus();
  }
function oeffnefenster2(seite){
 fenster =window.open(seite,'erklarung','width=800,height=600,top=0,left=0,scrollbars=yes,resizable=yes');
 posx=60;
 posy=60;
 fenster.moveTo(posx,posy);
 fenster.resizeTo(800,600);
 fenster.focus();
 }
 function oeffnefenster3(seite){
 fenster =window.open(seite,'erklarung','width=500,height=350,top=0,left=0,scrollbars=yes,resizable=yes');
 posx=60;
 posy=60;
 fenster.moveTo(posx,posy);
 fenster.resizeTo(500,350);
 fenster.focus();
 }