// Email Validation Javascript
// copyright 23rd March 2003, by Stephen Chapman, Felgall Pty Ltd

// You have permission to copy and use this javascript provided that
// the content of the script is not changed in any way.

//=====================================================================
// how to use it
// valid_email = validateEmail(email_field,mandatory,messages);
// email_field = email address needs to be validate;
// mandatory = 1 - compulsory field cannot be empty or null; 0 - optional field;
// messages = 1 - show detailed message for what is wrong; 0 - disable message
// valid_email = true - the email address is valid; false - the email address is invalid;
//=====================================================================

// for multi email address ==================================================
function multiEmail(email_field) {
	var email = email_field.split(',');
	for (var i = 0; i < email.length; i++) {
		if (!validateEmail(email[i], 1, 0)) {
			//alert('one or more email addresses entered is invalid');
			return false;
		}
	}
	return true;
}
//======================================================================

function validateEmail(addr,man,db) {
if (addr == '' && man) {if (db) alert('email address is mandatory');return false;}
var invalidChars = '\/\'\\ ";:?!()[]\{\}^|';
for (i=0; i<invalidChars.length; i++) {if (addr.indexOf(invalidChars.charAt(i),0) > -1) {if (db) alert('email address contains invalid characters');return false;}}
for (i=0; i<addr.length; i++) {if (addr.charCodeAt(i)>127) {if (db) alert("email address contains non ascii characters.");return false;}}
var atPos = addr.indexOf('@',0);
if (atPos == -1) {if (db) alert('email address must contain an @');return false;}
if (atPos == 0) {if (db) alert('email address must not start with @');return false;}
if (addr.indexOf('@', atPos + 1) > - 1) {if (db) alert('email address must contain only one @');return false;}
if (addr.indexOf('.', atPos) == -1) {if (db) alert('email address must contain a period in the domain name');return false;}
if (addr.indexOf('@.',0) != -1) {if (db) alert('period must not immediately follow @ in email address');return false;}
if (addr.indexOf('.@',0) != -1){if (db) alert('period must not immediately precede @ in email address');return false;}
if (addr.indexOf('..',0) != -1) {if (db) alert('two periods must not be adjacent in email address');return false;}
var suffix = addr.substring(addr.lastIndexOf('.')+1);
if (suffix.length != 2 && suffix != 'com' && suffix != 'net' && suffix != 'org' && suffix != 'edu' && suffix != 'int' && suffix != 'mil' && suffix != 'gov' & suffix != 'arpa' && suffix != 'biz' && suffix != 'aero' && suffix != 'name' && suffix != 'coop' && suffix != 'info' && suffix != 'pro' && suffix != 'museum') {if (db) alert('invalid primary domain in email address');return false;}
return true;
}