[LE] Getting a custom NPC to play a custom Idle animation through dialogue

[Quibblonian101]

I know there are various ways to get an animation to play by casting spells on NPCs but I am wondering how get an animation to start through a dialogue option using scripts in the CK. I already have my npc and I have the dialogue set up, I'm not sure how to get the script working through the topic though. I don't know if I have to use fragments or not and since I want to use a custom Idle I don't know how to add that in.