Loading all images on site through XML?

I have a timeline with several ‘sections’ and each section has a small picture. I want to make it so that when you enter a section the small picture loads in. This way I could avoid long initial load times. The problem is that every XML tutorial is for galleries and contains a lot of extra scripting I have trouble pulling out.

Is there a tutorial (or perhaps someone here could explain) how I can make the XML work so that all my images access one XML file, while only loading when they appear in the timeline?

thanks very much. Any help is appreciated. :emb: