public function onContentBeforeDelete($context, $data)
	{
		// Skip plugin if we are deleting something other than categories
		if ($context != 'com_categories.category')
		{
			return true;
		}

		// Check if this function is enabled.
		if (!$this->params->def('check_categories', 1))
		{
			return true;
		}

		$extension = JFactory::getApplication()->input->getString('extension');

		// Default to true if not a core extension
		$result = true;

		$tableInfo = array(
			'com_content' => array('table_name' => '#__content'),
		);

		// Now check to see if this is a known core extension
		if (isset($tableInfo[$extension]))
		{
			// Get table name for known core extensions
			$table = $tableInfo[$extension]['table_name'];

			// See if this category has any content items
			$count = $this->_countItemsInCategory($table, $data->get('id'));

			// Return false if db error
			if ($count === false)
			{
				$result = false;
			}
			else
			{
				// Show error if items are found in the category
				if ($count > 0)
				{
					$msg = JText::sprintf('COM_CATEGORIES_DELETE_NOT_ALLOWED', $data->get('title'))
						. JText::plural('COM_CATEGORIES_N_ITEMS_ASSIGNED', $count);
					JError::raiseWarning(403, $msg);
					$result = false;
				}

				// Check for items in any child categories (if it is a leaf, there are no child categories)
				if (!$data->isLeaf())
				{
					$count = $this->_countItemsInChildren($table, $data->get('id'), $data);

					if ($count === false)
					{
						$result = false;
					}
					elseif ($count > 0)
					{
						$msg = JText::sprintf('COM_CATEGORIES_DELETE_NOT_ALLOWED', $data->get('title'))
							. JText::plural('COM_CATEGORIES_HAS_SUBCATEGORY_ITEMS', $count);
						JError::raiseWarning(403, $msg);
						$result = false;
					}
				}
			}

			return $result;
		}
	}