Reporting Services 2005 HTML Viewer Stylesheet Problem with SP2

I am using Reporting Services 2005 and have created a custom stylesheet to be used with the HTML viewer via URL access, by adding the parameter &rc:stylesheet=MyStyleSheetName to the report URL. Everything worked just fine until I installed SP2, and now the report loads OK with the custom stylesheet being applied, but as soon as the View Report button is clicked it reverts back to the default stylesheet for the HTML viewer. Does anyone know the fix for this?

Thank you for your quick response. I am aware of the <HTMLViewerStyleSheet> property that can be added to the config file and that does work fine if you only need one stylesheet. What we do, is dynamically load a different stylesheet based upon who is viewing the reports. That is why I need to be able to specify the stylesheet in the URL.

I am continuing this discussion for PaulTeal (above)
We are using that technique that you mention above and it worked perfectly before the install of SP2. Now when we load a report with the URL parameter for the stylesheet it applies the stylesheet. As soon as the parameter values are chosen, and the View Report button is clicked, it reverts back to the default stylesheet for the HTML viewer. This is an obvious bug in the program.

Thanks a lot, I didn't know about that link.