I had thought about checking SquareSpace out, just to see if it actually produces half-decent code. I can see that that is not the case. It’s such a simple layout and yet it’s being produced in such a complicated manner.
I don’t have an answer for your question, it’ll take a bit of time to figure out all the absolute positioning, but I did notice that you have an
tag wrapping your entire slideshow, probably not the best choice!