Did you trie my comments? Like renaming texture[0] to texture[2] etc?

@Jetpack_Monkey:
-Create a modell with one normal skin
-Create the lightmap somehow
-Add the lightmap the the modell as second skin
-Copy&Paste the code i´ve postet
-Copy&Paste this too:

Code:

---

action FX_lightmapped
{
   my.material=mtl_lightmap;
}

---

Good luck