storing+removing an effect

[rAmPaGingONI]

i am using a trigger to attach a special effect to a building as a work animation for researching.
how would i make it so that when the research finishes or is canceled, i can remove the effect?

 

[Maker]

• Melee Initialization
  • Events
    • Map initialization
  • Conditions
  • Actions
    • Hashtable - Create a hashtable
    • Effect_Hash = (Last created hashtable)

• Untitled Trigger 064
  • Events
    • Unit - A unit Begins research
  • Conditions
  • Actions
    • Special Effect - Create a special effect attached to the overhead of (Triggering unit) using Abilities\Spells\Other\TalkToMe\TalkToMe.mdl
    • Hashtable - Save Handle Of(Last created special effect) as (Key effect) of (Key (Triggering unit)) in Effect_Hash

• Untitled Trigger 064 Copy
  • Events
    • Unit - A unit Finishes research
  • Conditions
  • Actions
    • Special Effect - Destroy (Load (Key effect) of (Key (Triggering unit)) in Effect_Hash)
    • Hashtable - Clear all child hashtables of child (Key (Triggering unit)) in Effect_Hash

Or you can use a special effect array with some indexing system.

 

[rAmPaGingONI]

thanks