Floating <div> at top even if user scrolls area

Floating <div> at top even if user scrolls area


Hi people
I'm trying to find a way to make a div to float at top, even if user
scrolls the window/area
For example, I've seen this example of a floating menu, that keeps in
the same position even if user scrolls
https://nettuts.s3.amazonaws.com/018_Floating_Menu/demo/dhtml_float_menu_final_nettut.html
but I want to apply that (in an easy way) to the blue div with a
number you can see here
http://img58.imageshack.us/img58/2599/sshot2it8.jpg
Is there any UI plugin or jQuery plugin that can do this easily ?
Thanks a lot in advance.
Enrique