var Hoch = screen.height;

function FensterAuf(Adresse)
{

if (Hoch >= 601)
  {
  Paras = "top=10,left=110,height=690,width=800,status=no,scrollbars=yes,resizable=1";
  var Oeffner = window.open(Adresse,"_blank",Paras);
  return;
  }

var Oeffner = window.open(Adresse,"_blank");

}