--- /home/fsouto/Downloads/moodle/course/externallib.php	2011-12-06 09:21:32.000000000 +0000
+++ course/externallib.php	2011-12-27 11:48:43.305342469 +0000
@@ -253,6 +253,71 @@
         );
     }
 
+
+	/**
+	* Delete categories
+	* @param array $options
+	* @return array
+	*/
+	public static function delete_categories($options) {
+		global $CFG, $DB;
+		require_once($CFG->dirroot . "/course/lib.php");
+		
+		$context = context_system::instance();
+        	self::validate_context($context);
+        	require_capability('moodle/category:manage', $context);
+		
+		//validate parameter
+		$params = self::validate_parameters(self::delete_categories_parameters(),
+							array('categories' => $options));	
+		
+		foreach ($params['categories'] as $category) {
+    			if (!$deletecat = $DB->get_record('course_categories', array('id'=>$category['id']))) {
+        			throw new moodle_exception(get_string('invalidcategoryid'), 'webservice', null);
+    			}
+			if (!empty($category['newparent']))
+				category_delete_move($deletecat, $category['newparent'], false);
+			else 
+				category_delete_full($deletecat, false);
+			$deletedcategories[] = array('id' => $category['id']);
+		}
+		return $deletedcategories;
+	}
+	
+	
+	/**
+	* Returns description of method parameters
+	* @return external_function_parameters
+	*/
+	public static function delete_categories_parameters() {
+		return new external_function_parameters(
+			array(
+			'categories' => new external_multiple_structure(
+				new external_single_structure(
+					array(
+						'id' => new external_value(PARAM_INT, 'category id to delete'),
+						'newparent' => new external_value(PARAM_INT, 'the parent category to move the contents to, if specified', VALUE_OPTIONAL)
+					)
+				)
+				)
+			)
+		);
+	}
+	
+	/**
+	* Returns description of method parameters
+	* @return external_function_parameters
+	*/
+	public static function delete_categories_returns() {
+		return new external_multiple_structure(
+			new external_single_structure(
+				array(
+					'id' => new external_value(PARAM_INT, 'category id'),
+					)
+				)
+			);
+	}
+	
     /**
      * Get courses
      * @param array $options