function validate(theForm)
{
  if (theForm.User.value == "")
  {
    alert("Please enter a username. ");
    theForm.User.focus();
    return (false);
  }
  if (theForm.Pass.value == "")
  {
    alert("Please enter a password. ");
    theForm.Pass.focus();
    return (false);
  }
  if (theForm.Email.value == "")
  {
   alert("Please enter an email address.");
   theForm.Email.focus();
   return (false);
  }	
  return (emailCheck (theForm.Email.value));
} 
function emailCheck (emailStr)
{
   var checkTLD=1;
   var knownDomsPat=/^(com|net|org|edu|int|mil|gov|arpa|biz|aero|name|coop|info|pro|museum)$/;
   var emailPat=/^(.+)@(.+)$/;
   var specialChars="\\(\\)><@,;:\\\\\\\"\\.\\[\\]";
   var validChars="\[^\\s" + specialChars + "\]";
   var quotedUser="(\"[^\"]*\")";
   var ipDomainPat=/^\[(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})\]$/;
   var atom=validChars + '+';
   var word="(" + atom + "|" + quotedUser + ")";
   var userPat=new RegExp("^" + word + "(\\." + word + ")*$");
   var matchArray=emailStr.match(emailPat);
   if (matchArray==null) {
   alert("Email address seems incorrect (check @ and .'s)");
   return false;
}
var user=matchArray[1];
var domain=matchArray[2];

for (i=0; i<user.length; i++)
{
   if (user.charCodeAt(i)>127)
   {
      alert("Ths username contains invalid characters.");
      return false;
   }
}
for (i=0; i<domain.length; i++)
{
   if (domain.charCodeAt(i)>127) 
   {
      alert("Ths domain name contains invalid characters.");
      return false;
   }
}


if (user.match(userPat)==null)
{
   alert("The username doesn't seem to be valid.");
   return false;
}

var IPArray=domain.match(ipDomainPat);
if (IPArray!=null)
{
   for (var i=1;i<=4;i++)
   {
      if (IPArray[i]>255)
      {
          alert("Destination IP address is invalid!");
          return false;
      }
   }
   return true;
}
var atomPat=new RegExp("^" + atom + "$");
var domArr=domain.split(".");
var len=domArr.length;
for (i=0;i<len;i++) 
{
    if (domArr[i].search(atomPat)==-1)
    {
       alert("The domain name does not seem to be valid.");
       return false;
    }
}

if (checkTLD && domArr[domArr.length-1].length!=2 && domArr[domArr.length-1].search(knownDomsPat)==-1)
{
    alert("The address must end in a well-known domain or two letter " + "country.");
    return false;
}

if (len<2) 
{
    alert("This address is missing a hostname!");
    return false;
}
return true;
}