/* ESTA Study Guides - optional helper script (v4).
The guide works without this (sections still open and close natively).
With it you also get: Expand all / Collapse all, contents links that open their section,
deep links (page-url#s4-calcite), all sections open when printing,
and a floating click-to-enlarge picture panel with zoom and pan (v4). Needs esta-guides_v5.css or later. */
