public function getRootCategoryId() {
$categories = Mage::getModel('catalog/category')->getCollection();
$categ_ids = $categories->getAllIds();
asort($categ_ids);
foreach ($categ_ids as $k =>
$cat_id) {
$category = Mage::getModel('catalog/category')->load($cat_id);
if ($category->name) {
return $cat_id; }
}
}