function emailCheck (emailStr) {

/* 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.  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|COM|ORG|EDU|NET|GOV)$/;

/* 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. */

/* Begin with the coarse pattern to simply break up user@domain into
different pieces that are easy to analyze. */

var matchArray=emailStr.match(emailPat);

if (matchArray==null) {

/* Too many/few @'s or something; basically, this address doesn't
even fit the general mould of a valid e-mail address. */

//alert("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("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;
   }
}

// See if "user" is valid 

if (user.match(userPat)==null) {

// user is not valid

//alert("The username doesn't seem to be valid.");
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) {

// this is an IP address

for (var i=1;i<=4;i++) {
if (IPArray[i]>255) {
//alert("Destination IP address is invalid!");
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 does not seem to be valid.");
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.");
return false;
}

// Make sure there's a host name preceding the domain.

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

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

//>>>

function check_email(e) {

if(emailCheck(e.value)) {
	// if the browser is Netscape 6 or IE
	if(document.all || document.getElementByID){
	// change the color of text field
	e.style.background = "white";
	}

	return 0 ;
} else
	// if the browser is Netscape 6 or IE
	if(document.all || document.getElementByID){
		// change the color of text field
		e.style.background = "yellow";
	}
	return 1;
	
}

function check_country(e,f) {
	if (e.value == 'Canada' || e.value == 'United States') {
		} 
	else {
		f.value = 'N/A';
		}
}

function check_state(e,f) {
	if (e.value == 'British Columbia' || e.value == 'Alberta' || e.value == 'Saskatchewan' || e.value == 'Manitoba' || e.value == 'Ontario' || e.value == 'Quebec' || e.value == 'Nova Scotia' || e.value == 'New Brunswick' || e.value == 'Prince Edward Island' || e.value == 'Newfoundland' || e.value == 'Yukon' || e.value == 'Nunavut' || e.value == "NW Territories") {
		f.value = 'Canada';
		} 
	else {
		if (e.value == '' || e.value == 'N/A') {
			if (f.value == 'Canada' || f.value == 'United States') {
				f.value = '';
			}
		} else {
			f.value = 'United States';
		}
		}
}


function check_required(e) {

	if(e.value.length < 1){
		e.focus(); // put the prompt in the name field 

		// if the browser is Netscape 6 or IE
		if(document.all || document.getElementByID){
		// change the color of text field
		e.style.background = "yellow";
		}
		
		return (2);
	} else
	{
		// if the browser is Netscape 6 or IE
		if(document.all || document.getElementByID){
			// change the color of text field
			e.style.background = "white";
		}
		return (0);
	}
	
}

function check_select(e) {

	if(e.value == ''){
		e.focus(); // put the prompt in the name field 

		// if the browser is Netscape 6 or IE
		if(document.all || document.getElementByID){
		// change the color of text field
		e.style.background = "yellow";
		}
		
		return (2);
	} else
	{
		// if the browser is Netscape 6 or IE
		if(document.all || document.getElementByID){
			// change the color of text field
			e.style.background = "white";
		}
		return (0);
	}
	
}


function check_form(f) { // f is the form (passed using the this keyword)

	valid = (check_required(f.elements['require:FirstName']));
	valid = valid + check_required(f.elements['require:Company']); 
	valid = valid + (check_required(f.elements['require:Street_Address']));
	valid = valid + (check_required(f.elements['require:City']));
	valid = valid + (check_required(f.elements['require:Zip_Code']));
	valid = valid + (check_required(f.elements['require:Phone']));
	valid = valid + (check_select(f.elements['STATE']));
	valid = valid + (check_select(f.elements['Country']));
	valid = valid + (check_email(f.elements['require:email']));
	
	if (valid >= 2) {
		alert("Please fill in all the required fields marked with *.");
		return false;
		}

	if (valid > 0) {
		alert("Please fill in a valid email address.");
		return false;
		}
	
}