texblend or visible for multiple textures

[vizmaster]

I am panning over a large panorama 50000x6000 pixels. Each tile represents 2kx2k portion of the entire image. Once the viewer is done with one image I want to display the next image in a timely manner. Currently an image can take up to 15 seconds to load. This is not acceptable for my needs. Therefore I plan on preloading the next image based on one of the methods I describe in this thread.
thanks for the ideas. Currently I am looking at still images. If I need motion I will keep your ideas in mind.