Let's assume that your radio group form component is named "radio". The items of this form component will have to look similar to this:
http://www.your_site.com/page1|Description 1 http://www.your_site.com/page2|Description 2 http://www.your_site.com/page3|Description 3
In the "Edit Form" tab, just fill in the "Return URL" option with the following syntax:
{radio:value}





