<!-- The scripts below were adapted from the emailCheck function -->
<!-- originally from The JavaScript Source!! http://javascript.internet.com -->
<!-- V1.1.3: Sandeep V. Tamhankar (stamhankar@hotmail.com) -->
<!-- Original:  Sandeep V. Tamhankar (stamhankar@hotmail.com) -->
<!-- Adapted for use at Scott and White -->

/*
---------INSTRUCTIONS----------------------------------
Include this VerifyEmailFields.js file.
On the form, include a call to the appropriate function(s)
in your form validation routine.

emailValid(id):
	Returns true if the field with specified id is a valid email address
	or if field is left blank.
	Returns false if invalid.

emailListValid(id):
	Returns true if field with specified id contains a valid email address
	or a comma-separated list of valid email addresses
	or if field is blank.
	Returns false if invalid.

***DO NOT USE THE emailValidAndNotBlank FUNCTION ON FORMS. IT IS FOR INTERNAL USE ONLY***  
emailValidAndNotBlank(emailStr,id):
	Returns true if emailStr is not blank and is a valid email address.
	Returns false if blank or invalid and sets focus to field with specified id.

-------------------------------------------------------
*/

/**********************************************************************/
function emailValid(id) {
	var emailStr = document.getElementById(id).value;
	if (emailStr.length == 0) {
		return true;
	}
	else {
		return emailValidAndNotBlank(emailStr, id);
	}
}
/**********************************************************************/
function emailListValid(id) {
	var emailListStr = document.getElementById(id).value;
	if (emailListStr.length == 0) {
		return true;
	}
	var arrSemiColons = emailListStr.split(";");
	if (arrSemiColons.length > 1) {
		document.getElementById(id).select();
		alert("Multiple email addresses must be separated by commas, not by semicolons.");
		return false;
	}
	var arrEmailAddress = emailListStr.split(",");
	var i = 0;
	var valid = true;
	for (i=0; (i<arrEmailAddress.length) && valid; i++) {
		valid = emailValidAndNotBlank(trim(arrEmailAddress[i]), id);
	}	
	return valid;
}
/**********************************************************************/
function emailValidAndNotBlank(emailStr, id) {
/***DO NOT USE THIS FUNCTION ON FORMS. IT IS FOR INTERNAL USE ONLY***/  

/* The following variable tells the rest of the function whether or not
to verify that the address ends in a two-letter country or well-known
TLD (top-level domain).  1 means check it, 0 means don't. */

	var checkTLD=1;

/* The following is the list of known TLDs that an e-mail address must end with. */

	var knownDomsPat=/^(com|net|org|edu|int|mil|gov|arpa|biz|aero|name|coop|info|pro|museum)$/;

/* The following pattern is used to check if the entered e-mail address
fits the user@domain format.  It also is used to separate the username
from the domain. */

	var emailPat=/^(.+)@(.+)$/;

/* The following string represents the pattern for matching all special
characters.  We don't want to allow special characters in the address. 
These characters include ( ) < > @ , ; : \ " . [ ] */

	var specialChars="\\(\\)><@,;:\\\\\\\"\\.\\[\\]";

/* The following string represents the range of characters allowed in a 
username or domainname.  It really states which chars aren't allowed.*/

	var validChars="\[^\\s" + specialChars + "\]";

/* The following pattern applies if the "user" is a quoted string (in
which case, there are no rules about which characters are allowed
and which aren't; anything goes).  E.g. "jiminy cricket"@disney.com
is a legal e-mail address. */

	var quotedUser="(\"[^\"]*\")";

/* The following pattern applies for domains that are IP addresses,
rather than symbolic names.  E.g. joe@[123.124.233.4] is a legal
e-mail address. NOTE: The square brackets are required. */

	var ipDomainPat=/^\[(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})\]$/;

/* The following string represents an atom (basically a series of non-special characters.) */

	var atom=validChars + '+';

/* The following string represents one word in the typical username.
For example, in john.doe@somewhere.com, john and doe are words.
Basically, a word is either an atom or quoted string. */

	var word="(" + atom + "|" + quotedUser + ")";

// The following pattern describes the structure of the user

	var userPat=new RegExp("^" + word + "(\\." + word + ")*$");

/* The following pattern describes the structure of a normal symbolic
domain, as opposed to ipDomainPat, shown above. */

	var domainPat=new RegExp("^" + atom + "(\\." + atom +")*$");

/* Finally, let's start trying to figure out if the supplied address is valid. */
	var emailele;
	emailele = document.getElementById(id);

//First, if email is blank then it is invalid
	if(emailStr.length == 0) {
		emailele.select();
		alert("An email address was left blank (check for double commas and leading or trailing commas).");
		return false;
	}
	
/* Begin with the coarse pattern to simply break up user@domain into
different pieces that are easy to analyze. */
	var matchArray=emailStr.match(emailPat);

/* Check for too many/few @'s or something; basically, this address doesn't
even fit the general mould of a valid e-mail address. */
	if (matchArray==null) {
		emailele.select();
		alert("The email address seems 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).
	for (i=0; i<user.length; i++) {
		if (user.charCodeAt(i)>127) {
			alert("The username portion of the address (before the '@') contains invalid characters.");
			emailele.select();
			return false;
		}
	}
	for (i=0; i<domain.length; i++) {
		if (domain.charCodeAt(i)>127) {
			alert("The domain name portion of the address (after the '@') contains invalid characters.");
			emailele.select();
			return false;
		}
	}

// See if "user" is valid 
	if (user.match(userPat)==null) {
		alert("The username portion of the address (before the '@') doesn't seem to be valid.");
		emailele.select();
		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. */
	var IPArray=domain.match(ipDomainPat);
	if (IPArray!=null) {
		for (var i=1;i<=4;i++) {
			if (IPArray[i]>255) {
				alert("Destination IP address (after the '@') is invalid!");
				emailele.select();
				return false;
			}
		}
		return true;
	}

// Domain is symbolic name.  Check if it's 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 portion of the address (after the '@') is not valid.");
			emailele.select();
			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. */
	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.");
		emailele.select();
		return false;
	}

// Make sure there's a host name preceding the domain.
	if (len<2) {
		alert("The domain name portion of the address (after the '@') is not valid.");
		emailele.select();
		return false;
	}

// If we've gotten this far, everything's valid!
	return true;
}