// Validate E-mail Address (JavaScript 1.0 version)
//
//  $Id: email.js,v 1.4 2002/02/20 18:42:46 nwiggins Exp $
//
//  $Log: email.js,v $
//  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) {
	var strInvalid = "*?#&^~`'\\[]<>;/:\" ";
	var bAliasedEmail = false;
	var  strAliasedEmail = "";
	
	var i = 0;
    var  bValid;
	bValid = true;

	objFld.value = alltrim(objFld.value);
	if (isEmpty(objFld.value))
		return true;

	var strEmail = new String(objFld.value);

	// 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	// 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) {
		alert("Please enter a valid email address");
		objFld.value = "";
		objFld.focus();
		return bValid;
	}
	
	if (bAliasedEmail)
	 this.value = strAliasedEmail;
	else
	 this.value = strEmail;
	
	return bValid;
}