Here is what I am trying to do:

NPC dialogue topic 1: give me caps or go away
player response 1: ok (pay caps, reveal diaologue 2)
player response 2: nah

NPC dialogue topc 2: blah blah blah

What I want is for diaologue topic 1 to be repeatable until player response 1, and then removed from future dialogues with the NPC. After player response 1, I want dialogue topic 2 to be repeatable.

I've been looking into Leo Stalh's Megaton dialogue, which uses getquestvariable to get/set the condition for triggering a hidden topic. The problem is that I can't find the script or where the variable is stored, so I don't know how this is really accomplished. Any ideas?

If you can find the quest Leo Stalh's Megaton dialogue uses, open it and under first tab "Quest Data", it should have the script is uses there. GetQuestVariable seems to be just like GetScriptVariable, except it's pointing to a quest's script.

if GetQuestVariable LeoStalhMegatonDialogue.SomeVar1 == 0, dialogue topic 1.
on player response 1, result script: set LeoStalhMegatonDialogue.SomeVar1 to 1 ;(dialogue topic 1 is now false)

if GetQuestVariable LeoStalhMegatonDialogue.SomeVar1 == 1, dialogue topic 2.

Quest LeoStalhMegatonDialogue using script:
scn LeoStalhMegatonDialogueSCRIPT
short SomeVar1

So Dialogue 1, info 1 has two choices. When the second choice is selcted, either set a variable or a quest stage in the results script for the second choice response. Use the value of the variable or quest stage as a condition for dialogue 1. Dialogue 1 then has two infos. The first uses conditions that the variable from option 2 has not been picked yet and info 2 uses a condition that was set when option 2 was chosen. So in this case your dialogue 2 is really the second info for dialogue 1.

[edit]

Nevermind, I got it working now. Thanks to you both!

Oh, snag, how do I detect if the player has sufficient amount of caps? I tried GetItemCount cap001 (amount) but that didn't work...I suppose you carry 100 cap items in their inventory...

Did you use 'On Target'?

Yea that should work... make sure, like Talkie said, you use it on target.

I use the http://cs.elderscrolls.com/constwiki/index.php/GetGold function for that. IMHO, I think its more reliable.

Ah ok, on Target worked. Thanks TTT.

Out of curiosity, why do you prefer GetGold WillieSea?

If I may answer for WillieSea - Some have reported that Getitemcount Caps001 does not always return the correct amount while getgold will. I, however have never had this happen during my use of it.