FancyBox return to previous item
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I have a bog standard FancyBox script which allows a div to be displayed using FancyBox, within the div are thumbnails using the WordPress gallery all using FancyBox via the (.gallery a) handle so when selected they then open within the same FancyBox window.

What I'm struggling to do is return to the previous window (the main div wrapper holding this contents which first opened using FancyBox as at the moment the only option I have is to close FancyBox altogether), ideally I'd like to display a button which says 'back'.

So closing the child FancyBox element and returning to the parent essentially.

Any pointers, much appreciated.