using numlock to generate numbers in X apps

["Benedict Verheyen" <linux4bene@pandora.be>]

Hi,

i have an ~/Xmodmap with this content:
keycode 79 = Home
keycode 87 = End
keycode 81 = Prior
keycode 89 = Next
keycode 83 = Left
keycode 88 = Down
keycode 85 = Right
keycode 80 = Up

I specified these keycodes to be able to navigate with the right
keypad in apps like Evolution. I found the above keys by using Xev to see 
the codes. I then used the codes from the small keypad and specified them 
for the keys of the large keypad. It seems to work ok.

Now i would like these settings to be overridden when i push the numlock 
key so i can then generate numbers instead of navigating.

How do i specify this for X and console? I do not know that much
on keyboard settings. I found stuff on loadkeys, dumpkeys, keymap,
getkeycodes, setkeycodes and to be honest, it sounds a bit complicated.

Anyway, any sollution or links to tutorials (simple) are welcome.

Thanks,
Benedict