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<?php echo $form->input('username', array('maxlength' => '255', 'size' => '35', 'label' => 'Email Address as Username (ex: user@example.com)'));?>
        <?php
            echo $ajax->observeField('AccountUsername',
                array(
                    'url' => array('action' => 'validateusername')
                )
            );
        ?>