function popup(mylink, windowname)
   {
   if (! window.focus)return true;
   var href;
   if (typeof(mylink) == 'string')
      href=mylink;
   else
      href=mylink.href;
   window.open(href, windowname, 'width=620,height=490,scrollbars=yes,resizable=yes,top=20,left=20');
   return false;
   }