it should be backspace.
you might need a movie config, or some pk3 with quality textures if you want nicer graphics.
about the mod, I only wanted to know if it's jaymod or not. Because if it's not jaymod, there are some mods you can use to watch demos specifically made for movies, maybe you could be interested in one of those, but let's keep it simple.
AHHH It's Jaymod ... :S I suck at ETpub and never palyed ETpro :S