Altering behaviour of ALT Key in linux

Hi,

I want to alter the functionality of ALT key for qwerty keypad in
ubantu 10.10.

My requirement is i have numeric's  1,2,3,4,... etc  on keys
q,w,e,r,...as secondary keys.
For these numerics i have to use with modifier alt.
Example for numeric "one" i have to use alt+q.

I have studied man page of loadkeys but not able to figure it out how
to go with this.

Please reply me if any body has ideas.

Thanks,
Haranath.