public function removeListener( MW_Observer_Listener_Interface $l, $action )
	{
		if( isset( $this->_listeners[$action] ) )
		{
			foreach( $this->_listeners[$action] as $key => $listener )
			{
				if( $listener === $l ) {
					unset( $this->_listeners[$action][$key] );
				}
			}
		}
	}