Minor style tweaks
Fixed positioning of grandchild windows; getElementOffset() does not work inside a div positioned with top,left.
Pikto's header tab highlight improved, so tweak no longer needed
Merge branch 'master' of https://github.com/joeytwiddle/code

Conflicts:
	other/gm_scripts/joeys_pikto_tweaks/joeys_pikto_tweaks.user.js