The CS4 version has an option to apply an object style, and it should work in CS3. You can get it from:
(click the Scripting Resources) tab to get to the scripting page. The CS4 sample scripts are posted there for download. Let me know if it works for you!
I downloaded the file on that site, but no Object Style option on that one either.
Hm. I'll have to check that out. In the meantime, I can send you a copy directly via email--click my user name to see my address.