listbox containg open files in javascript

Can anybody point me to a sample-script that shows how to create a listbox of the open documents?
Im looking for something similar to how the Script »Load Files into Stack« (which is installed with Photoshop I think) does it, but without the need for the Folder-selection-option.
I tried looking up that Scripts structure, but I dont get it ... because it utilizes libraries and stuff thats way out of my understanding of JavaScript I guess.

I know its the lazy thing to do, asking You. But that stuff really proves difficult to me ...