Bug#418437: iceape-browser: PageUp and PageDown keyboard navigation not working properly

[Stefaan]

> Could it be somehow that it stops working properly when the mouse cursor
> gets over a flash object ?
>   
Flash as far as I can see is no prerequisite. It seems to be occurring 
on pages with
different columns. Somehow the cursor seems to jump to a different 
column upon
pressing pagedown/pageup. If that column (e.g. used for navigation) is 
not as long as the
actual text I am trying to read, I get "stuck".

An example page which as far as I can see does not contain flash, and 
where i have the problem
is here: http://nl.wikipedia.org/wiki/Portaal:Biologie