Resizing Images

I have hundreds of pictures, and planning on creating a photography portfolio.
I created a movie clip to be a thumbnail of my photo (size: 100x100) and use AS to load the JPEG into the it, and then with AS, I made the thumbnail expands to 600x600 when it is clicked, but the images did not do the same.

Is there a way to load a 600x600 JEPG into a 100x100 movie clip and then resize as the movie clip does?

Thanks a lot