Magento 1.7 Custom Attribute – Add Category Custom Attribute with Dropdown

I need to add to category a custom atribute , a select with 2 values:

• 0 – "No"
• 1 – "Yes"

I created a module and used this code in installation file:

$this->startSetup();
$this->addAttribute('catalog_category', 'top_brand', array(
    'group'                => 'General',
    'type'              => 'int',//can be int, varchar, decimal, text, datetime
    'backend'           => '',
    'frontend_input'    => '',
    'frontend'          => '',
    'label'             => 'Top Hersteller',
    'input'             => 'select', //text, textarea, select, file, image, multilselect
    'option' => array(
        'value' => array(

            'optionone'=> array(
                0 =>'No'),
            'optiontwo'=> array(
                0 =>'Yes')
        ),

    ),
    'default' => array(0),
    'class'             => '',
    // 'source'            => '',//this is necessary for select and multilelect, for the rest leave it blank
    'global'             => Mage_Catalog_Model_Resource_Eav_Attribute::SCOPE_GLOBAL,//scope can be SCOPE_STORE or SCOPE_GLOBAL or SCOPE_WEBSITE
    'visible'           => true,
    'frontend_class'     => '',
    'required'          => false,//or true
    'user_defined'      => true,
    'default'           => '',
    'position'            => 100,//any number will do
));
$this->endSetup();

Attribute appear in administration panel but value added in select for "No" is 3 and for "Yes" is 4.
How to make value 0 and 1 ?