invoke function from its name as string

["Ludovic Coquelle" <lcoquelle@gmail.com>]

First, hello everyone as it is my first message to this list ;)

I'm trying to solve this problem:
I have a module name and function name in string variables,
and I would like to call this function, like :
let mod = "MyMod" in
let fn = "my_fun" in
what_come_here mod fn

Can this problem be solved?
Was thinking that camlp4 could help ... not sure as it change the
syntax tree but I don't see how to get access to module name 'mod'.

Any pointer are greatly appreciated :)
thanks