var last=0;

          function toEuro()
   {
     var r=document.AddrForm.DM.value;
     r=r.replace(/,/,".");
     r=(r/1.95583);
     if (document.AddrForm.Runden.checked==true) r=(Math.round(r*100)/100);
     if (isNaN(r)) r="Fehler!";
     document.AddrForm.Euro.value=r;
     last=1;
   }

          function toDM()
   {
     var r=document.AddrForm.Euro.value;
     r=r.replace(/,/,".");
     r=(r*1.95583);
     if (document.AddrForm.Runden.checked==true) r=(Math.round(r*100)/100);
     if (isNaN(r)) r="Fehler!";
     document.AddrForm.DM.value=r;
     last=2;
   }

   function update()
   {
      if (last==1) toEuro();
      else if (last==2) toDM();
   }