[kronolith] OS X problems

[Jason Rust]

> Using Internet Explorer:
> kronolith never loads. The rest of horde (login, imp, turba, mnemo, 
> nag) works fine (although the collapsable menus don't collapse!) but 
> when clicking on "Calendar", the right frame just sits there loading 
> forever (hangs).

Had the same problem, and after much frustrating debugging figured out
it's an odd mac IE bug with lots of images in nested tables.  Check out
_prefs_hook_show_icons() in hooks.php

-Jason