//******************************************************************************************//

//********************* functions  for email-id validation ****************************//

//******************************************************************************************//

function isValidEmail(emailStr) {

	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);

	if (matchArray==null) {

		return "Email address seems incorrect (check @ and .'s)";

		//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) {

			return "Ths Email address contains invalid characters.";

			//return false;

		}

	}

	for (i=0; i<domain.length; i++) {

		if (domain.charCodeAt(i)>127) {

			return "Ths domain name contains invalid characters.";

			//return false;

		}

	}

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

		return "The Email address doesn't seem to be valid.";

		//return false;

	}

	var IPArray=domain.match(ipDomainPat);

	if (IPArray!=null) {

		for (var i=1;i<=4;i++) {

			if (IPArray[i]>255) {

				return "Destination IP address is invalid!";

				//return false;

	   		}

		}

		return 0;

	}

	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) {

			return "The domain name does not seem to be valid.";

			//return false;

	   }	

	}

	if (checkTLD && domArr[domArr.length-1].length!=2 && 

		domArr[domArr.length-1].search(knownDomsPat)==-1) {

		return "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) {

		return "This address is missing a hostname!";

		//return false;

	}	

	return 0;

}