Magento : Adding a Yes/No type custom category attribute

Hello, Here is the another magento code snippet that i have got to share with you.

[php]
<?php
require_once("app/Mage.php");
Mage::app('default');
Mage::app()->setCurrentStore(Mage_Core_Model_App::ADMIN_STORE_ID);

$installer = new Mage_Eav_Model_Entity_Setup('core_setup');
$entityTypeId = $installer->getEntityTypeId('catalog_category');
$attributeSetId = $installer->getDefaultAttributeSetId($entityTypeId);
$attributeGroupId = $installer->getDefaultAttributeGroupId($entityTypeId, $attributeSetId);

$installer->addAttribute('catalog_category', 'left_nav', array(
'group' => 'General Information',
'type' => 'int',
'label' => 'Show in left navigation',
'input' => 'select',
'global' => Mage_Catalog_Model_Resource_Eav_Attribute::SCOPE_STORE,
'visible' => true,
'required' => false,
'user_defined' => false,
'default' => 0,
'source' => 'eav/entity_attribute_source_boolean'
));
?>
[/php]

After running this script and refreshing the admin end you will find the added attribute at end of General Information tab.

Hope this helps some one
Thanks.