public function renderList( $itemClassPrefix = "level-" ){
		$list	= array();																			//  
		foreach( $this->headings as $item ){														//  
			$link	= UI_HTML_Tag::create( 'a', $item->label, array( 'href' => "#".$item->id ) );	//  
			$attributes		= array( 'class' => $itemClassPrefix.$item->level );							//  
			$list[]	= UI_HTML_Elements::ListItem( $link, 0, $attributes );							//  
		}
		return UI_HTML_Tag::create( 'ul', $list, array( 'class' => 'index-list' ) );				//  
	}