static function setHooks($parser)
 {
     global $wgHooks;
     $parser->extSyntaxHighlighter = new self();
     if (!SyntaxHighlighter::$hookInstalled) {
         $wgHooks['ParserAfterTidy'][] = array($parser->extSyntaxHighlighter, 'addHeadItems');
         SyntaxHighlighter::$hookInstalled = true;
     }
     $parser->setHook('source', array($parser->extSyntaxHighlighter, 'source'));
     return true;
 }