Is it possible to preload images using PHP to hide the image names being preloaded, or to simply use some sort of JavaScripting to do just this?

Thanks in advance.

You can just store the image in a non web accessible location and stream the image using PHP.

Not positive that's what you're looking for, though.

I think he wants the user to preload, then show the whole page at once

Use CSS.

google "Sliding Doors"

There are a few different ways to do this depending on exactly what you are looking for. Is this for rollover buttons or to have the whole website pop in at the same time.