[Zope] Restatement of list problem

[Schmidt, Allen J.]

Maybe I over-complicated my original request.

I have a form field that is a list: 
['2 DR CONVERTIBLE','2 DR COUPE','2 DR HATCHBACK']

The URL looks like this: 
vehicleList?bt=2+DR+CONVERTIBLE&bt=2+DR+COUPE&bt=2+DR+HATCHBACK

When I pick for years 2002 and 2001 for the above body types, the URL
changes a bit:
vehicleList?yr%3Alist=2002&yr%3Alist=2001&bt%3Alist=%5B%272+DR+CONVERTIBLE%2
7%2C+%272+DR+COUPE%27%2C+%272+DR+HATCHBACK%27%5D

>From this search, I get no results. If I manually take out the %5B and %3A
etc. codes it works fine.

How do I keep the above conversion from happening?

Thanks again!

-Allen