public function _validation_required_with($val, $field)
	{
		if ( ! $this->_empty($this->input($field)) and $this->_empty($val))
		{
			$validating = $this->active_field();
			throw new \Validation_Error($validating, $val, array('required_with' => array($this->field($field))), array($this->field($field)->label));
		}

		return true;
	}