Display only a subset of steps at time when you have a lot of steps

If the floating box containing the steps follows the scrolling of the browser window (see https://blueprints.launchpad.net/collective.amberjack/+spec/floating-box-should-follow-window-scrolling) you get an annoying problem when you have a lot of steps: the latest ones will be always hidden at the bottom of the page.

One solution could be to display only a subset of steps. For instance, you can display only the "previous" step, the "current" step, and the "next" step so that you know "where" you are in the steps' chain.

A "show all" option could be also provided in order to display all the steps.