How can I change form of cursor for some progs?

["Egor Tur" <worldeb@ukr.net>]

Hi.
I want to change form of cursor when I use some programme.
Can I do this?
For example, when I press the icons on my desktop, I want that
cursor have form of watch (or other forms) until programme 
(which I start in icon) set up. I use idesk for icons on my desktop
and xfce 3.8.18 version.
Many thanks.