Change links above images to point to the IQDB image search

// ==UserScript==
// @name           4chan - Image search links
// @namespace      http://userscripts.org/scripts/show/43268
// @include        http://boards.4chan.org/*
// @include        http://4chanarchive.org/*
// @description    Change links above images to point to the IQDB image search.  Works with the 4chan extension.
// @updated        2011-02-03
// ==/UserScript==

var imageSearch = "http://danbooru.iqdb.hanyuu.net/db-search.php?url=";
 //Danbooru:         "http://danbooru.iqdb.hanyuu.net/db-search.php?url=";
 //Multi-service:    "http://iqdb.hanyuu.net/?url=";
 //nothing:          null;

function modifyLinks(e)
{
 var link = (e ? e.target : document).getElementsByTagName("a");
 for( var i = 0; i < link.length; i++ )
 {
  if( /^[0-9]+X+$/.test( link[i].textContent ) )
   link[i].textContent = link[i].href.replace(/(javascript:quote\('|'\)|.*#q)/gi,'');
  else if( imageSearch && "filesize" == link[i].parentNode.getAttribute("class") && !/\.iqdb\./.test( link[i].href ) )
   link[i].href = imageSearch + link[i].href.replace(/\/src\//,'/thumb/').replace(/....$/,'s.jpg') + "&fullimage=" + link[i].href;
 }
}

if( !/\/res\//.test(location.href) )
 window.addEventListener( "DOMNodeInserted", modifyLinks, true );
modifyLinks();

function updateCheck( dayDelay )
{
 var scriptNum = 43268;
 if( parseInt( GM_getValue('last_check', 0) ) + 24*3600*1000 < new Date().getTime() ) GM_xmlhttpRequest(
 {
  method: 'GET',
  url: 'http://userscripts.org/scripts/source/'+scriptNum+'.meta.js?'+new Date().getTime(),
  headers: { 'Cache-Control': 'no-cache' },
  onload: function(response)
  {
   GM_setValue( 'last_check', ''+new Date().getTime() );

   var localVersion = parseInt( GM_getValue( 'local_version', 0 ) );
   var remoteVersion = parseInt( /@uso:version\s*([0-9]+?)\s*$/m.exec(response.responseText)[1] );
   dayDelay = parseInt( GM_getValue( 'day_delay', dayDelay ) );
   
   if( !localVersion || remoteVersion <= localVersion )
    GM_setValue( 'local_version', remoteVersion );
   else if( dayDelay > 0 )
    GM_setValue( 'day_delay', dayDelay - 1 );
   else if( confirm( 'There is an update available for the Greasemonkey script "'+/@name\s*(.*?)\s*$/m.exec(response.responseText)[1]+'".\nWould you like to go to the install page now?' ) )
   {
    GM_openInTab( 'http://userscripts.org/scripts/show/'+scriptNum );
    GM_setValue( 'local_version', remoteVersion );
    GM_deleteValue( 'day_delay' );
   }
  }
 });
}updateCheck(2);