// Validate E-mail Address (JavaScript 1.0 version) 
// 
// $Id: email.js,v 1.11 2006/05/05 21:18:27 jreed Exp $ 
// 
// $Log: email.js,v $ 
// Revision 1.11 2006/05/05 21:18:27 jreed 
// Added regular expression version of validEmail() function 
// 
// Revision 1.10 2006/05/03 18:05:28 jseverson 
// Setting language variable from get parameter if present. 
// 
// Revision 1.9 2006/03/22 19:16:00 jseverson 
// Adding multi language support for alerts 
// 
// Revision 1.8 2006/02/25 00:53:09 jreed 
// In addition to selecting a field after failure, also set the focus 
// 
// Revision 1.7 2004/08/25 01:55:11 jreed 
// Split validEmail into two function - validEmailText can be passed the text value 
// 
// Revision 1.6 2004/07/30 21:25:35 jreed 
// Modified validemail() - when invalid select existing value rather than blanking it 
// 
// Revision 1.5 2003/10/31 18:20:48 jseverson 
// fixed bug with emails ending in periods. Bug 3603 
// 
// Revision 1.4 2002/02/20 18:42:46 nwiggins 
// 
// # removes script tags - forces usage as a javascript src include. no php includes 
// 
// Revision 1.3 2001/07/18 23:07:57 jneil 
// Fixed some problems. 
// 
// Revision 1.2 2001/07/02 06:11:18 vhegde 
// Revision 1.1 2001/05/21 15:53:53 jneil 
// Initial Upload. 
// 
/************************************************************** Description: Email address must be of form a@b.c i.e., there must be at least one character before the @ there must be at least one character before and after the . the characters @ and . are both required Dependencies: alltrim, isEmpty, occurs of string.js **************************************************************/ 
function validEmail(objFld) { 
	if (!validEmailText(objFld.value)) { 
		alert('Please enter a valid email address'); 
		objFld.select(); 
		objFld.focus(); 
		return false; 
	} 
	return true; 
} 
function validEmailText(strEmailText) { 
	var strInvalid = "*?#&^~`'\\[]<>;/:\" "; 
	var bAliasedEmail = false; 
	var strAliasedEmail = ""; 
	var i = 0; 
	var bValid; 
	bValid = true; 
	strEmailText = alltrim(strEmailText); 
	if (isEmpty(strEmailText)) return true; 
	var strEmail = new String(strEmailText); 
	// Assumption: if strEmail contains < and >, Email is between < and > 
	if (strEmail.indexOf('<') < strEmail.indexOf('>') && strEmail.indexOf('<') >= 0) { 
		bAliasedEmail = true; 
		strAliasedEmail = strEmail; 
		strEmail = strEmail.substring(strEmail.indexOf('<')+1,strEmail.indexOf('>')); 
	} 
	if (strEmail.length < 5) 
	// check the length 
	bValid = false; 
	else if (strEmail.lastIndexOf("@") <= 0 || (strEmail.lastIndexOf(".") - strEmail.lastIndexOf("@") <= 1)) 
	// check positions of @ and . 
	bValid = false; 
	else if (occurs('@', strEmail) > 1) 
	// check if @ occurs more than once 
	bValid = false;
	else if (strEmail.lastIndexOf(".") == (strEmail.length - 1)) 
	// check to make sure email doesnt end in period 
	bValid = false; else 
	// check if any invalid characters present 
	{ 
		for (i = 0; i < strEmail.length; i++) if (strInvalid.indexOf(strEmail.charAt(i)) >= 0) { 
			bValid = false; 
			break; 
		} 
	} 
	if (!bValid) { 
		return bValid; 
	} 
	if (bAliasedEmail) this.value = strAliasedEmail; 
	else this.value = strEmail; 
	return bValid; 
} 
// This one doesn't accept aliases, but it does check for a valid extension. 
function validEmailTextAlt(strEmailText) { 
	return (strEmailText.search(/^\w+((-\w+)|(\.\w+))*\@[A-Za-z0-9]+((\.|-)[A-Za-z0-9]+)*\.(com|edu|gov|mil|net|org|biz|info|name|museum|us|ca|uk)(\:[0-9]+)*(\/($|[a-zA-Z0-9\.\,\;\?\+&%\$#\=~_\-]+))*$/) != -1); 
}