function emailCheck (emailStr)   
{
	emailStr = emailStr.toLowerCase();	
/* 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)$/;

/* 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("Invalid Email address");
login.email.focus();
return false;
}
var user=matchArray[1];
var domain=matchArray[2];

var firstChar = user.substr(0,1);
if (firstChar.charCodeAt(0)>47 && firstChar.charCodeAt(0)<58)
{
	alert("Invalid Email address");	
	login.email.focus();
	return false;
}

        
var vindex=emailStr.indexOf('@');         
if(vindex<0){}
else{
var subvindex=emailStr.substr(0,vindex);
var charpos1 = subvindex.search("[^A-Za-z0-9\._]");           
if(charpos1 >= 0) 
	{ 
	    alert("Invalid Email address");	
		login.email.focus();
		return false;
	 }//if 

}          


// 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("Invalid Email address");		
		login.email.focus();
		return false;
   }
}
for (i=0; i<domain.length; i++) 
{
	if (domain.charCodeAt(i)>127)
	{
	alert("Invalid Email address");	
	login.email.focus();
	return false;
   }
}

// See if "user" is valid 

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

// user is not valid

alert("Invalid Email address");
login.email.focus();
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<5;i++)
		{
		if (IPArray[i]>255)
			{
				alert("Invalid Email address");
				login.email.focus();
				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("Invalid Email address");
login.email.focus();
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("Invalid Email address");
login.email.focus();
return false;
}

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

if (len<2) {
alert("Invalid Email address");
login.email.focus();
return false;
}

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

function isMessageOk()
{
	var field_val=login.message.value.replace(/[ ]/g, "");
	if (field_val.length==0){
		alert('Please type your Message');
		login.message.focus();
		return false;
		}
	return true;
}

function isFirstNameOk(){
	var field_val=document.login.fname.value.replace(/[ ]/g, "");
	if(field_val!=0){
			return true;
		}
	alert('Please Enter First Name');
	document.login.fname.focus();
		return false;	
}

function isLastNameOk(){

	var field_val=document.login.lname.value.replace(/[ ]/g, "");
	if(field_val!=0){
			return true;
		}
	alert('Please Enter Last Name');
		document.login.lname.focus();
		return false;
}

function doSubmit(){
	browserDetect();
	if(emailCheck(document.login.email.value) && isFirstNameOk() && isLastNameOk() && isMessageOk()){
		document.login.submit();
	}
	return false;
}

function browserDetect()
{
	 if(document.layers)
	 {
		thisbrowser="NN4";
		login = document.login;
	 }
	 if(document.all)
	 {
		thisbrowser="ie";
	 }
	 if(!document.all && document.getElementById)
	 {
		thisbrowser="NN6";
		login = document.login;
	 }   
}