A family of Microsoft presentation graphics products that offer tools for creating presentations and adding graphic effects like multimedia objects and special effects with text.
Hi,
As John's mentioned, this can be trickier than it appears at first blush (though your particular situation does simplify things compared to the general problem of resizing any old PPT).
I have a commercial resizing add-in that will get you most of the way there:
The free demo will allow you to test it thoroughly; it will create a resized version of your presentation containing the first five slides of the original (which it will not touch).
It won't reposition the images as you've described, but if you want to give it a try and then post a link to a resized presentation or two in reply here, I'll be happy to have a go at writing a bit of VBA to take it the rest of the way. I can't guarantee that it'll be possible, but at these prices (nada), you wouldn't be risking much.