Slightly more mobile friendly

[stuartlangridge]

It would be lovely if the page was a teensy bit more mobile friendly -- specifically, if the "next image" button were a lot bigger so it's easier to press it without accidentally pressing the "skip to end" button and so losing one's place and having to start over. Sorry for whining rather than just fixing it, but I'm in the pub on my phone and so it's hard to test a patch.

[MagicalTux]

You can use the "back" button if you go accidently to the wrong frame (using browser history to keep track of your moves).
I do guess something like https://jgestures.codeplex.com/ to detect gestures and detect swipe right/left would be best.