drupal webform sliding radio button
You may use Webform module and read this.

The full documentation is at http://drupal.org/documentation/modules/webform.

You can achieve the conditional field with Webform Conditional.


  This modules enhances the existing Conditional Rules of the Webform
  Module. It adds the ability to make components dependent on select
  components(i.e. listboxes, radio buttons, and checkboxes) that appear
  on the same page.


Here's a youtube video Screencast demo.


  Webform already has support for conditional fields on multi-page
  forms. For example Field C on Page 2 can be dependent on Field A on
  Page 1. This module adds the ability to have conditional fields on the
  same page. This module adds the ability to have Field B on page 1 be
  dependent on Field A also on Page 1.


Check the version of the Webform module; you may have it already.