How do you check the browser cache for an swf?

1

Hey all. I’m building a hybrid php/flash site that has a php body and a flash navigation bar.

I have two problems right now:

  1. Due to the way that I built my preloader, I need to be able to tell if the swf file is already in the browser cache (because if it is, I can just skip the preloader sequence).

  2. I would like my nav bar to play one animation sequence if a user has just come to the site (this is the first page that they’ve loaded up of the site) and play a different animation sequence if the user has come from another page within my site (they’re browsing the site).

I am using php for this site, so maybe that could help out with these problems, but i’m pretty stumped about the best way to solve these issues. Any input or suggestions would be most appreciated.

Thanks!