<!--
function emailCheck (emailStr, fieldNum) {

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 domainPat=new RegExp("^" + atom + "(\\." + atom +")*$");
var matchArray=emailStr.match(emailPat);

// CHECK: Does the e-mail address contain @ and . in an incorrect sequence?
if (matchArray==null) {
//   alert("The e-mail address entered in E-mail " + fieldNum + " is incorrect. (check @ and .'s)");
// return false;
}

var user=matchArray[1];
var domain=matchArray[2];

// Start by checking that only basic ASCII characters are in the strings (0-127).
// CHECK: Does the user name contain one or more invalid characters?
for (i=0; i<user.length; i++) {
   if (user.charCodeAt(i)>127) {
//      alert("The e-mail address entered in E-mail " + fieldNum + " contains invalid characters.");
//      return false;
   }
}

// CHECK: Does the domain name contain one or more invalid characters?
for (i=0; i<domain.length; i++) {
   if (domain.charCodeAt(i)>127) {
//      alert("The e-mail address entered in E-mail " + fieldNum + " contains invalid characters.");
//      return false;
   }
}

// See if "user" is valid 
// CHECK: Is the user name valid?
if (user.match(userPat)==null) {
//   alert("The username of the e-mail address entered in E-mail " + fieldNum + " is invalid.");
// return false;
}

/* if the e-mail address is at an IP address (as opposed to a symbolic
host name) make sure the IP address is valid. */
// CHECK: Is the destination IP address valid?
var IPArray=domain.match(ipDomainPat);
if (IPArray!=null) {
   // this is an IP address
   for (var i=1;i<=4;i++) {
      if (IPArray[i]>255) {
         alert("The destination IP address of the e-mail address entered in E-mail " + fieldNum + " is invalid.");
         return false;
      }
   }
   return true;
}

// Domain is symbolic name.  Check if it's valid.
// CHECK: Is the symbolic domain name valid?
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 of the e-mail address entered in E-mail " + fieldNum + " is invalid.");
//      return false;
   }
}

/* domain name seems valid, but now make sure that it ends in a
known top-level domain (like com, edu, gov) or a two-letter word,
representing country (uk, nl), and that there's a hostname preceding 
the domain or country. */
// CHECK: Does domain name end with a TLD or two-letter country code?
if (checkTLD && domArr[domArr.length-1].length!=2 && 
domArr[domArr.length-1].search(knownDomsPat)==-1) {
//   alert("The e-mail address entered in E-mail " + fieldNum + " must end in a well-known top-level domain (like .com or .net) or two letter country code.");
// return false;
}

// Make sure there's a host name preceding the domain.
// CHECK: Is the host name missing?
if (len<2) {
//   alert("The e-mail address entered in E-mail " + fieldNum + " is missing a host name.");
// return false;
}

// If we've gotten this far, the e-mail address is valid.
return true;
}
//-->