url2thum.user.js

// ==UserScript==
// @name           url2thum
// @namespace      pascal.orz.cn
// @include        http://*.2ch.net/*
// ==/UserScript==

var ExObject = function(){
  var obj = this;
  this.replace_html = function(filter){
    obj.innerHTML = filter(obj.innerHTML);
    return this;
  };
};

var wrapArray = function(xs){
  var fn = arguments.callee;
  xs.maph = function(filter) fn(xs.map(function(x) x.replace_html(filter)));
  return xs;
};

var bindReady = function(callback){
  document.addEventListener( "DOMContentLoaded", function(){
    document.removeEventListener( "DOMContentLoaded", arguments.callee, false );
    callback();
  }, false );
};

var xfind = function(xpath) {
  var results = document.evaluate(xpath, document, null,
  XPathResult.UNORDERED_NODE_SNAPSHOT_TYPE, null);
  var nodes = new Array();
  for(var i=0; i<results.snapshotLength; i++){
    var x = results.snapshotItem(i);
    ExObject.prototype = x;
    nodes.push(new ExObject());
  }

  return wrapArray(nodes);
};

var Validator = {
  isFunction: function( obj ){return typeof(obj) == "function";},
  isArray: function( obj ){return toString.call(obj) === "[object Array]";}
};

var $ = function(arg){
  return (Validator.isFunction(arg)) ? bindReady(arg)
                                     : xfind(arg);
};

//$(function(){
    var ttp = /([^h])(ttp:\/\/[\x21-\x7E]+)/ig;
    $("//dd").maph(function(x) x.replace(ttp, "h$2") )
             .maph(function(x) x.replace(/(http.*\.jpg)/g,
					 "<img src='$1' width='240px' height='320px'/>") );
// });