[kh99]

I tried to add this to the above post but for some reason I'm having a problem. Anyway:

It is an interesting idea. It seems like what you'd want to do is something like, have cache.php return code that sets a variable to a different value depending on whether or not that particular user is loading it, then just load it with <script src="cache.php"> and check the value of the variable. Also maybe set it to not cache if a guest loads it, that way it won't get cached before the user logs in.