public function removeAttributeGroup($attribute_group_name, $attribute_group_id, $attributeSetId)
 {
     $setup = new Mage_Eav_Model_Entity_Setup('core_setup');
     $mapobj = Mage::getModel('customimport/customimport');
     $attributeGroupId = $mapobj->getAttributeGroupByExternalId($attribute_group_id, $attributeSetId);
     if ($attributeGroupId) {
         $setup->removeAttributeGroup('catalog_product', $attributeSetId, $attributeGroupId);
     } else {
         $this->customHelper->reportInfo($this->customHelper->__("Attribute Group is not available to be removed."));
     }
 }