// ==UserScript==
// @name          Change community.livejournal.com/commname ... to commname.livejournal.com
// @namespace     http://livejournal.arricc.net/
// @description   Modify links to LJ communities
// @include       http://*.livejournal.com/*
// ==/UserScript==

(function(){
  var commRegEx = /^(http:\/\/community\.livejournal\.com)?\/([^/]+)(\/)?(.*)/i;

  var l = document.getElementsByTagName("a");
  for (var cand = null, i = 0; (cand = l[i]); i++) {
    uim = commRegEx.exec(cand.getAttribute('href'));

    if (uim != null) {
      cand.setAttribute('href','http://' + uim[2] + '.livejournal.com/' + uim[4]);
    }
  }
})();