function checkdomain(domainname,domaintld,wdt,hgt) {
  window.open('http://www.visualweb.nl/whois/whois.php?domainname=' + domainname + '&domaintld=' + domaintld, 'popup', 'toolbar=0,scrollbars=1,location=0,statusbar=0,menubar=0,resizable=1,width=' +wdt+ ',height=' +hgt+ '');
}