Module for floating vertical and customizable image menu
You can use Floating block module 

Floating Block Module page says


  The Floating block module allows you to keep html blocks, selected
  using jquery selectors in a fixed position on the page as you scroll.
  It works in a similar way the table header fixer in Drupal Core. This
  means that when the user scrolls their browser selected parts of the
  page can stay in the users view.