Hello, i'm a newbie script maker.

Is there any way to add some buttons near search box in contact list like in this picture, buttons added by Avalon Concept skin?

Not possible with scripts, unfortunately.

If so, could you explain how to do it with a skin, basicly?

Essentially, just copy and paste the code from the Viewing options button (next to where you have circled), and alter the command and image (if I recall correctly.)