Use Action to Execute Script in External HTML Object?

Standard Disclaimer: I searched for an hour but didnt' find it.

Here's What I'd Like to Do, but Don't Know How:

I'd like to have a bit of JavaScript or jQuery written out and brought in to my title as an External HTML Object. BUT, I don't want it to run right away when the page loads (that is, "On: Show"). I'd like it to sit there quietly until an action in my title calls it up (for example Action = On: Whatever, Action: Run, Target: That Script in the External HTML Object).

So my lame attempt at this is:

1. Write a Script in Dreamweaver and Save it.
2. Import it as an External HTML Object on my Page
3. Make the External HTML Object "Not Initially Visible"
4. Add an Action set to ON: MClick - Action: Show - Target: External HTML Obj.
5. And the External HTML Object would then "Show" and thus run its script.

I also tried On: MClick (or whatever) Action: Launch Program / Document and then go find the .js file. Nope, that doesn't do it either.

Has anyone been able to do this?