var re = /^\w+[\w.-]*@([\w-]+\.)+\w+$/;  // format of an email.  ex. blah@blue.com
                                                                                
function testEmail( field )
    {
        var email = field.value.toLowerCase();
        field.value = email;
        var ok = re.exec(email);
        if( !ok )
            { window.alert("\"" + email + "\" is not a valid email address.  Please re-enter."); return false; }
        else
            { return true; }
    }