Added possibility to show overlays on page load + fix issue #6 #9
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In this commit I added a setting to show overlays on page load. That way the overlay with info is expanded as soon as the page loads. I needed the function for my own website. Perhaps it's handy for others too.
Other commit fixes a bug in navigation in Firefox. See issue #6. The code deselects anything selected, so the image isn't highlighted. It'd be better to find out why the image is highlighted in the first place though.