[Closed] How to set a radiobutton by current renderer?

Hi guys;

I know how to get current renderer, but…

1. I want to do this:

[ul]
[li]If current renderer is scanline then set my radio button default to 1.[/li][li]If current renderer is mental ray then set my radio button default to 2.[/li][/ul]2. Also I want to be able to change current renderer by changing the radio button.

Previously thanks