On the N810 (OS .43-7) :
In the bottom left corner of the stylus keybord,
click the icon, >tools >settings.

Here you change the layout of the sliding keyboard (to e.g. Russian).
The file defining the layouts is
/usr/share/X11/xkb/symbols/nokia_vndr/rx-44 .

I'm afraid Hebrew is not supported, but in principle you could add a Hebrew layout in the rx-44 file.
It is beyond my knowledge if the settings menu above would automatically include such additions.
Maybe this what ukeyboard does ?

fanoush and Snake helped me find this:
http://talk.maemo.org/showthread.php...825#post280825