protected function getInput()
	{
		// Initialize some field attributes.
		$class = $this->element['class'] ? ' class="' . (string) $this->element['class'] . '"' : '';
		$disabled = ((string) $this->element['disabled'] == 'true') ? ' disabled="disabled"' : '';
		$value = $this->element['value'] ? (string) $this->element['value'] : '1';

		if (empty($this->value))
		{
			$checked = (isset($this->element['checked'] )) ? ' checked="checked"' : '';
		}
		else
		{
			$checked = ' checked="checked"';
		}

		// Initialize JavaScript field attributes.
		$onclick = $this->element['onclick'] ? ' onclick="' . (string) $this->element['onclick'] . '"' : '';

		return '<input type="checkbox" name="' . $this->name . '" id="' . $this->id . '"' . ' value="'
			. htmlspecialchars($value, ENT_COMPAT, 'UTF-8') . '"' . $class . $checked . $disabled . $onclick . ' />';
	}