function emailIsValid( sEmail ) {
	nAtSign = sEmail.indexOf("@");
	if( nAtSign > -1 ) {
		if( sEmail.indexOf( "@", nAtSign + 1 ) > -1 ) {
			return false;
		}
	}
	nPeriod = sEmail.lastIndexOf(".");
	if( ( nAtSign <= 0 ) 
		|| ( nPeriod > ( sEmail.length - 3 ) ) 
		|| ( ( nPeriod - nAtSign ) <= 2 ) )	{
		return false;
	}
	return true;
}