Fixed position sidebar with jQuery

How do I incorporate 开发者_JS百科the following sidebar menu feature using jQuery where the menu on the left re-appears as the user scrolls down the page?

Here's an example sidebar menu.

There's a really good tutorial over at Nettuts about this exact thing:

Creating a Floating HTML Menu Using jQuery and CSS

Jquery CSS Control:

http://css-tricks.com/scrollfollow-sidebar/

and tutorial is also nice,

if you are using bootstrap then you can use affix control of bootstrap, that is also good