how does it work to reach #specials href ?

Hi,
I really don't find how you make the scroll effect from the "button" Specials (for example) in the home page to reach the good position.
I can't find any anchor called "specials" in the source code.
I'd like to have the same effect on other links but it seems very difficult to do that.
Can you help ?
Regards

Ok once again I've found it on my own. I give there the solution because it was hard for me to find out how to do - It's not very difficult in fact.
Method :
1 - in modules, create or transform an existing "custom HTML" module
2 - edit what you want here - a presentation for example (text, images, etc...)
3 - choose a position for the module (bottom 5 for example) and save
4 - go to Extensions / Template manager
5 : click on Menu tab
6 : at "Module ID override" choose your module position (bottom 5). Be sure there is no other bottom 5 position already assigned in the list below. If that is the case you will have to find another position at step 3
7 : at ID: Give a name (presentation) for example
8 : click "save Rule" and don't forget to save the template configuration !
9 : go back to Modules and choose the module positionned at "Header" position
10 : Copy/paste one of the existing link (Menu / Specials / Gallery ...) and rename it as you want (Presentation)
11 : edit source code in this module and find the link you copied - change the "href" to what you expect
example : <a href="#Gallery"> has to be replaced with <a href="#presentation">
12 : save and enjoy
I hope I haven't forgot anything ...

Cheers, good info