magento - Getting the category name of multi level -

i'm working on website , got name of parent category of category. how can name of main category contain multiple subcategory. main category "a" has "b" sub category inturn has "c" subcategory, subcategory called "d". managed name of category "a" if products in category "b". not getting how category name "a" if products in category "d". please in this. code parent name goes this.

$currentcat = mage::registry('current_category'); $parentid = mage::registry('current_category')->getparentid(); $parent = mage::getmodel('catalog/category')->load($parentid); $parentname = $parent->getname(); 

the above code fetch parent category name of current category. how multi level parent name. please me on this. i'm newbie magento.

`  $parentid = mage::registry('current_category')->getparentid();  $parent = mage::getmodel('catalog/category')->load($parentid);  while($parentid != 0) {//check root category      $parent_cat_array[] = $parent->getname();      $parentid = $parent->getparentid();      $parent = mage::getmodel('catalog/category')->load($parentid);  }   print_r($parent_cat_array);  ` 

just iterate every parent till reaches root category