Preload external jpgs individually

Let me be the first to say that I am far from being an expert at actionscript… I have spent hours upon hours trying to work this out and I am sure it is not that hard!

What I am trying to achieve is to implement a feature where the user clicks on a thumbnail to view a larger image. I want the larger image to load with a preloader, then once the user closes the larger image to then be able to view another larger image…

I have attached a FLA file to show what I am trying to do. All the tutorials I have come accross load the images with next/previous buttons - but I don’t want this as I want the user to be able to select whichever thumbnail they wish to view.

Can anyone help me out?