https://plinky.com/javascripts/people/ajax_follow.js

1$(function()
2{
3	var follow = '/people/%s/follow?%d',
4		unfollow = '/people/%s/unfollow?%d';
5	
6	function toggleFollow(url, show)
7	{
8		$.ajax({
9			url: url.replace('%d', Math.random()),
10			type: 'POST',
11			data: {},
12			success: function()
13			{
14				show.fadeIn('fast');
15			}
16		});
17	}
18	
19	$('p.follow').each(function()
20	{
21		var will_follow = $(this).find('span.username').text(),
22			nodes = {
23				is_following: $(this).find('span.is_following'),
24				not_following: $(this).find('span.not_following')
25			};
26		
27		nodes.is_following.find('a').click(function(e)
28		{
29			e.preventDefault();
30			nodes.is_following.fadeOut('fast', function()
31			{
32				toggleFollow(unfollow.replace('%s', will_follow), nodes.not_following);
33			});
34		});
35		
36		nodes.not_following.find('a').click(function(e)
37		{
38			e.preventDefault();
39			nodes.not_following.fadeOut('fast', function()
40			{
41				toggleFollow(follow.replace('%s', will_follow), nodes.is_following);
42			});
43		});
44	});
45});