function imgaload(name) {
  imga[name+'1']=new Image();
  imga[name+'1'].src='/images/'+name+'1.gif';
  imga[name+'2']=new Image();
  imga[name+'2'].src='/images/'+name+'2.gif';
}
function imgashow(n1,n2) {
  document.images[n1].src=imga[n2].src;
}
function ukfpopup(seite,titel,breite,hoehe,zusatz) {
   op="width="+breite+",height="+hoehe;
   if (zusatz) {
      op+=","+zusatz;
   }
   xo=(screen.width-breite)/2;
   if (xo<1) xo=1;
   yo=(screen.height-(hoehe+30))/2;
   if (yo<1) yo=1;
   f1=open(seite,titel,op);
   f1.moveTo(xo,yo);
} 
function switchon(id) {
   document.getElementById(id).style.visibility = "visible";
}
function switchoff(id) {
   document.getElementById(id).style.visibility = "hidden";
}
function switchchange(id) {
   if (document.getElementById(id).style.visibility=="visible") {
      document.getElementById(id).style.visibility = "hidden";
   }
   else {
      document.getElementById(id).style.visibility = "visible";
   }
}