Ignore getComputedStyle() failure in progress getter
Was "TypeError: window.getComputedStyle(...) is null" in closing window:
destroyAutoClose()
-> this.progress.hidden = true;
Optimize: don't touch not initialized progressmeter
(in addition for previous commit)
Expose commandDispatcher for Up/Down/Left/Right hotkeys on twisties
(#9)
Move scripts from frame document into separate file
(too many code to leave it directly in *.html)
(#8)