(re-send as it seems it didn't go through)

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