toc.hide.show boolean
toc.hide.show Enable hide/show button for ToC frame

## Description

If non-zero, JavaScript (and an additional icon, see hidetoc.image and showtoc.image) is added to each slide to allow the ToC panel to be toggled on each panel.

There is a bug in Mozilla 1.0 (at least as of CR3) that causes the browser to reload the titlepage when this feature is used.