executing a chunk several times

[christof@...]

Hello,

I encountereed a problem with executing a chunk several times:

I load a script from a file by executing luaL_loadfile().
As I see, it is put on the stack as a function.
Now I set some global data as input for the script
and then run it by lua_pcall().
After popping the results from the stack, the stack is 
empty, because the lua_pcall() popped also the 
function from the stack.

I would like to execute the chunk a second and more times,
but I couldn't find out, how to preserve it and push it
back onto the stack for subsequent pcalls.

What did I miss?

Regards
Christof