SSRS 2005 Is there a way to change the text of Boolean Parameter labels in the selection bar?

I created a report in SQL Server 2005 Reporting Services that has multiple boolean parameters. I'd like to change the text from "true" or "false" to "Yes" or "No" is this possible? I don't want a dropdown of values I would prefer to keep it as 2 radio buttons.

A little more detail...

At the top of the reporting page there is a list of parameters to filter the report by. I setup some of the parameters as boolean. So they display at the top like this "LABEL TEXT  O True  O False" what I want it to look like is this "LABEL TEXT  O Yes  O No".

Thanks for the help