Help Downloading Files

Question

In my project I need to be able to download new images to be displayed. It will function like an updater.
I know how to download a file by specifiying a specific URI.

However I will not know the file names. I want it to go to a certain web directory, say http://www.go.com/pictures, and then download all the pictures in there. So far I have been unable to find a way to do this.

I have a work around where I can point to a text file on the website that will then point to each individual picture, but that seems unnecessary to me.

So, is there any way to do this?