Lua Embedding Question

[James Turk <james@...>]

I am working on a pretty simple bomberman-esque game, and I was really 
wanting to embed Lua for the first time in it, I have a few questions so 
please bear with me.  Basically what I'm thinking of doing is having a 
BomberEnemy class, then having an init##.lua that would be called for 
the various levels to create some enemies and perhaps set some settings, 
this I could fairly easily work out.  Then I was thinking of having 
enemyType.lua files for each enemy type, and then each enemy would call 
Update each frame which would call it's lua script to do the AI.

BomberMap,BomberPlayer,BomberEtc.. then
BomberEnemy -> LuaBomberEnemy (in style of recently posted Account c++ 
example)
then the enemy.lua files could access all the functions of a 
BomberEnemy.. helping it find empty positions, the player position and 
other useful methods.  My problem is if I use this technique the Lua 
objects would be created via Lua (of course I could have the constructor 
stick them in a static container) and would then need to be accessed 
from C++, for stuff like collision detection with other players and 
drawing, yet basically one method (BomberEnemy::Act) would need to call 
Lua.  How would I be able to write an enemies AI, something like:

if(curtime() - enemy.LastBomb() > 1000)
     enemy.PlaceBomb();
if(enemy.MapEmpty(FORWARD))
     enemy.MoveForward();

I was thinking that since classes accessed from Lua basically have a 
static method access an internal pointer I could somehow pass an enemy 
pointer in, but I'm not familiar with all that boxpointer stuff.  I was 
thinking from C++
void BomberEnemy::Act()
{
      //pass self into Lua somehow as a LuaBomberEnemy named enemy
      //run a single file 'dumb_enemy.lua'
}

If anybody can give me any insight into the best way to work this system 
I'd appreciate it greatly. 

     -James

(PS. Thanks to Peter Shook for his Account example which answered some 
of my other questions.)