// Changes:  Sandeep V. Tamhankar (stamhankar@hotmail.com)
//  This script and many more are available free online at 
//  The JavaScript Source!! http://javascript.internet.com
//  Begin 

//SN - Added Silent Parameter - so that we can just check the email address with this script, but not alert the customer
function emailCheck (emailStr,silent) { 
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) 
if (matchArray==null) { 
	if(!silent){
	alert("Email address seems incorrect (check @ and .'s) Email address in NOT Optional!!!") 
	}
	return false 
} 
var user=matchArray[1] 
var domain=matchArray[2] 
// See if "user" is valid 
if (user.match(userPat)==null) { 
    // user is not valid 
   if(!silent){
    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) { 
	     
		    if(!silent){
				alert("Destination IP address is invalid!") 
			}
		return false 
	    } 
    } 
    return true 
} 
 
// Domain is symbolic name 
var domainArray=domain.match(domainPat) 
if (domainArray==null) { 
	if(!silent){
		alert("The domain name doesn't seem to be valid.") 
	}
    return false 
} 
 
/* domain name seems valid, but now make sure that it ends in a 
   three-letter word (like com, edu, gov) or a two-letter word, 
   representing country (uk, nl), and that there's a hostname preceding 
   the domain or country. */ 
 
/* Now we need to break up the domain to get a count of how many atoms 
   it consists of. */ 
var atomPat=new RegExp(atom,"g") 
var domArr=domain.match(atomPat) 
var len=domArr.length 
if (domArr[domArr.length-1].length<2 || 
    domArr[domArr.length-1].length>4) { // accomedate for .info , CK
   // the address must end in a two letter or three letter word. 
  	if(!silent){
		alert("The address must end in a 3-4 letter domain, or two letter country.") 
	}
   return false 
} 
 
// Make sure there's a host name preceding the domain. 
if (len<2) { 
   var errStr="This address is missing a hostname!" 
  	if(!silent){
		 alert(errStr) 
		}
   return false 
} 
 
// If we've gotten this far, everything's valid! 
return true; 
}