Add follow button to Twitter time line

twitter_follow_button.js

// ==UserScript==
// @name           Twitter Follow Button
// @namespace      http://d.hatena.ne.jp/MillyC/
// @description    Add follow button
// @include        http://twitter.com/*
// @exclude        http://twitter.com/oauth_clients*
// @exclude        http://twitter.com/oauth/*
// @exclude        http://twitter.com/settings/*
// @version        0.1
// ==/UserScript==

(function($) {

	$('#timeline>li.status')
		.live('mouseover', function() {
			var actions = $(this).find('ul.actions-hover');
			if (!actions.find('span.follow')[0]) {
				actions.prepend('<li><span class="follow"><span class="follow-icon"></span><a href="/friendships/create/">Follow</a></span></span></li>');
			}
		})

	$('#timeline ul.actions-hover span.follow')
		.live('click', function() {
			var user = (/\bu-(\S+)/.exec($(this).parents('li.status').attr('class')) || {})[1];
			if (user) followUser(user);
			return false;
		});

	function followUser(user) {
		console.log('following ' + user);
		$.ajax({
			url: 'http://twitter.com/friendships/create/' + user + '.json',
			type: 'POST',
			dataType: 'json',
			cache: false,
			success: function(r) {
				console.log('followed ' + user);
			},
			error: function(data) {
				console.log('cannot follow ' + user);
			}
		});
	}

})(unsafeWindow.$ || window.$);