http://d.hatena.ne.jp/mallowlabs/20070111/1168511218

google_multi_search.user.js

// ==UserScript==
// @name Google Multi Search
// @author mallowlabs
// @version 0.0.3
// @namespace http://mallowlabs.s206.xrea.com/
// @published 2007-01-11
// @modified 2007-01-17
// @license public domain
// @description : Add Blog and Code search option to Google search
// @include       http://www.google.co*/
// @include       http://www.google.co*/webhp*
// ==/UserScript==

(function() {

	var ginput = document.getElementsByTagName('input');

	var par;

	for (var i = 0; i<ginput.length; i++){
		if(ginput[i].id == 'all') {
			par = ginput[i].parentNode;
		}
	}

	if (par!=null) {
		par.innerHTML = par.innerHTML
					+ "<input id='blog'  type='radio'  name='lr' value='lang_ja'>"
					+ "<label for='blog' >"
					+ decodeURI("%E3%83%96%E3%83%AD%E3%82%B0%E3%81%8B%E3%82%89%E6%A4%9C%E7%B4%A2")
					+ "</label>"
					+ "<input id='src'  type='radio'  name='lr' value='lang_ja'>"
					+ "<label for='src' >"
					+ decodeURI("%E3%82%BD%E3%83%BC%E3%82%B9%E3%82%B3%E3%83%BC%E3%83%89%E3%81%8B%E3%82%89%E6%A4%9C%E7%B4%A2")
					+ "</label>";
		
		for (var i = 0; i < par.childNodes.length; i++ ){
			if(par.childNodes.item(i).tagName == 'INPUT')
			switch (i/2){
				case 0:case 1:
					par.childNodes.item(i).addEventListener('click',
						function(e){
							var f = document.getElementsByTagName('form')[0];
							f.setAttribute('action', '/search');
						}
					, false);
					break;
				case 2:
					par.childNodes.item(i).addEventListener('click',
						function(e){
							var f = document.getElementsByTagName('form')[0];
							f.setAttribute('action', 'http://blogsearch.google.com/');
						}
					, false);
					break;
				case 3:
					par.childNodes.item(i).addEventListener('click',
						function(e){
							var f = document.getElementsByTagName('form')[0];
							f.setAttribute('action', 'http://www.google.com/codesearch');
						}
					, false);
					break;
			}
		}
	}


})();