How do I use VSTS Test Edition 2005 to automate webtests execution for different physical enviornments?

Question

The following link in MSDN provides details about how to parameterize the web servers of a web test. http://msdn.microsoft.com/en-us/library/ms184806.aspx#

If I have an in-house development environment and a production environment, I'd like to reuse the same webtests for both environments without having to re-run scripts.