In Magento for getting root category id for current store view you should just run a code
<?php
$rootCategoryId = Mage::app()->getStore()->getRootCategoryId();
?>
For getting root category id of specific store view, you have to just pass store Id to getStore function
<?php
$storeId = 22;
$rootCategoryId = Mage::app()->getStore($storeId)->getRootCategoryId();
?>
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