LUA Script question.. [AI_Tick?]

[Lakotaness]

So my question is what is this event do? The ID for it is 5 [AKA RegisterUnitEvent(71002, 5, "Atali_poision") ] And I'm wondering is this like an AI_Agent almost? Like it would cast a certain percent of times or something.

My aim is to make a mob that cast an AOE posion at random times through combat, hoever AI_Agents on my server are really screwy. They always cast at spawn requardless of the event ID and keep casting untill the allowed castamount is reached but thats not what I need.

Basic question: Is there a way to script a mob in LUA so that it would randomly cast a spell throught the fight at a set chance? Not like at health intervals.. or is that how I would have to do it?

[Edit: More like 2 questions ]

[Whitethebunny]

I did find a command in a script from the LUA++ SVN (http://mmoforge.org/svn/luaplusplus/) that would let you set a variable as a random number. Which you might be able to manipulate to cast the spell randomly, or at least a random chance to cast every _ seconds.

(From the Gehennas 100% blizzlike script)

local rand = math.random(#,#)

From the looks of it:
Change the first # to the starting number, and the second # to the finishing number.

i.e. (1,5)

Would be a random number from 1 to 5.

-!- Not sure if this activates the math.random command but at the top of the script it has: math.randomseed(os.time())

[TheSpidey]

AI_Tick procs at a set interval. In C++ scripts you can set it yourself. I suspect that Lua scripts set the AI Tick to weapon speed.