function popup(url,typ,para1,width,height)
{
 attrib="";
 Y=(screen.height-width)/2;
 X=(screen.width-height)/2;
 X=Math.round(X);
 Y=Math.round(Y);
 if (para1=='CENTER') {attrib+='height='+height+',width='+width+',top='+Y+',left='+X;}
 if (typ=='TYP1') {attrib+=",scrollbars=no";}
 if (typ=='TYP2') {attrib+=",scrollbars=yes";}
 if (typ=='TYP3') {attrib+=",scrollbars=yes,menubar=yes";}
 x=Math.random();
 fenster=window.open(url,'win',attrib);
  return false;
}