Delegating key actions

[Karan Bathla]

Hi

I would like to be able to use n,p,j,; as down,up,left,right respectively upon 
invocation of a function/minor-mode. Is there already some package that does 
something like this?
I want to delegate all keystrokes i.e. "C-n" and "M-n" would do "C-<down>" and 
"M-<down>" whatever function that keystroke corresponds to in the buffer. 

Thanks
Karan