Function modules and generically typed tables

I want to write a function module which will take an internal table with an entirely arbitrary line type as its input and output a table in HTML. This is not very difficult to do in ABAP as long as I can get the table in and out. However, I have no idea how to transfer a generic table. At the moment I can see myself having to do something truly horrible to hack around this, when all I want to do is use "describe table" and a couple of "do...enddo" loops.

I really, really hope this is a dead easy question to answer...