The Nano Scrollbar module comes with the option to apply vertical scrollbars to side-wide content such as all nodes or all blocks. You will find the configuration options under the User Interface section of the Drupal administration menu.
This handbook is about how to setup fivestar 7.x-2.0 to use for a review system.
The code examples were initially posted in the issue queue of computed_field, but this should be a more appropriate place.
The code below contains an implementation of fivestar that is used as a review system. It contains some code for your custom module. Replace 'MYMODULE' with the name of your module.