Does anyone know how one would go about precaching some images for a page I'm creating? The trick is, I only know which pictures to precache at the very top of the script, so the list can't be stored in a .js file like normal. Since there are different pictures for different users, the script needs to precache the pictures dynamically. Anyone know how to?

I don't think you can do this with PHP, as PHP is a server side scripting language... that is too say every thing that PHP does is on the server not on the client aka the end user's computer. What you are talking about sounds like JavaScript but then you said no js because you vary your list...

the compromise:
why not generate several different js files and use a switch statement in PHP to dertemine which js file to load based on whatever permissions the user has

OR

you can be very fancy and use PHP to auto-generate your js files ... just make sure to output the correct headers so that your browser knows to read it as a js file and not a php file