with_hatebu_search.user.js

// ==UserScript==
// @name           with hatebu search
// @namespace      http://b.hatena.ne.jp/
// @description    google 検索の画面で、はてブ検索へのナビゲーションを出します
// @include        http://www.google.co.jp/search*
// @include        http://www.google.com/search*
// ==/UserScript==

(function () {
    var tr = $X('//tr[td/input[@name="q"]]');
    if (tr.length) {
      var q = document.getElementsByName('q')[0];
      var td = document.createElement('td');
      var a = document.createElement('a');
      var ACTION = a.href = 'http://b.hatena.ne.jp/search';
      var img = document.createElement('img');
      img.src = 'http://b.hatena.ne.jp/images/search-mini.png';
      img.title = img.alt = 'はてなで検索';
      img.style.border = 'none';
      a.appendChild(img);
      td.appendChild(a);
      a.addEventListener('click', function() {
        a.href = ACTION + '?q=' + q.value;
      }, false);
      tr[0].appendChild(td);
    }
// very simple version of $X
// $X(exp);
// $X(exp, context);
// $X(exp, context, resolver);
// @source http://gist.github.com/29681.txt
function $X (exp, context, resolver) {
  context || (context = document);
  var Doc = context.ownerDocument || context;
  var result = Doc.evaluate(exp, context, resolver, XPathResult.ORDERED_NODE_SNAPSHOT_TYPE, null);
  for (var i = 0, len = result.snapshotLength, res = []; i < len; i++) {
    res.push(result.snapshotItem(i));
  }
  return res;
}
})();