JQuery - Scroll to Top

I just did a JQuery tutorial that I thought was quite interesting. Using this JQuery code allows you to scroll to the top of the page without even scrolling at all. This could be a convenient use for the user, if he/she wants to start from the top again.

Here is the link to my example:
http://tsouzasf.aisites.com/jquery-prac/

In case you want to try, Here is the link to the tutorial I did:
http://blog.netisme.com/tutorials/xhtml-css/scroll-gototop-apparition-jquery-css.html