Circular motion

Hi, I’m stucking with this circular movement now.
I would really appreciate if someone help me.

I’m new to the actionscript and wanted to get some effect
in my contents with it, and I’ve got the original free file of
this fla and tried to change some of the lines but it’s difficult
for me to understand all of the script lines.

Each gray ball has it’s original script, and I want to change
the value of “centerx” and “centery” to 450 and 200 or
something bigger, but it makes the movement kind of strange,
as you see the black balls below.

I want the black balls have the same movements to
gray balls, and I tried to change some values of the script
lines in black balls, but I couldn’t make so much change
for the movements at all.

If you know what to do with the script or help me
in some way, it would be really, really appreciated.

Thanks.=)