scrollbar of non-standard size

[S Sh <misterx ssh gmail com>]

Hi!
At first, sorry for my English.
In my application I need to do a scrollbar of a bigger size than in standard
case. I.e. all the elements of a scrollbar - arrow buttons and a slider must
be of a bigger size.
Can you suggest the better (or the easiest) way to do this?
Thanks in advance.

Stepan.