public static function ListItem( $content, $level = 0, $attributes = array() )
	{
		$depth	= 2 * abs( (int) $level ) + 1;
		$indent	= str_repeat( "  ", $depth );
		$tag	= UI_HTML_Tag::create( "li", $content, $attributes );
		$code	= $indent.$tag;
		return $code;
	}