// user's functions

isNS4 = (document.layers) ? true : false;
  isIE4 = (document.all && !document.getElementById) ? true : false;
  isIE5 = (document.all && document.getElementById) ? true : false;
  isNS6 = (!document.all && document.getElementById) ? true : false;

  function checkdom(d_name,domain) {
   var dwidth=720; var dheight=650;
   var leftpos = (self.screen.width / 2) - (dwidth / 2);
   var toppos = (self.screen.height / 2) - (dheight / 2);
   var query = '/inc/checkdom.php?d_name='+d_name+'&domain='+domain;
   var title = 'Проверка домена';
   if (isIE5) window.showModalDialog(query,title,'dialogHeight:'+dheight+'px; dialogWidth:'+dwidth+'px; resizable:yes; status:no'); 
   if (isNS6) {
     window.open(query,title,'status=no,width='+dwidth+',height='+dheight+', left='+leftpos+',top='+toppos+''); 
   return false;
   }
  }