Loading thumbnails from folder

I have created a sliding thumbnail viewer for a slideshow in flash, however I would like to load the thumbnails from a folder so that when the images in the folder change the flash file is updated.
At the moment I have the thumbnails as buttons contained in a movieclip, allowing me to click the thumbnail to load up the fullsize image in the slideshow. Can I load the images from a folder with this set up?
I would have uploaded the file for you to see, but its too big so the forum won’t let me.