as a suggestion, it's probably worth while to add the complementary previous preload also. i added it to the xp slide and it works great.
i know i often jump in the middle of an index page and sometimes go backwards. the cool part is, you'll only load both on the first jump into the slide. past that, scrolling in either direction, you'll have already loaded the page you were just on, so that's a freebie, and you then only load the next/previous image in the direction that you're going.
I want to add an extra comment in this post
This thread is very complete on the preload topic.
But yesterday I discovered that there is more needed than only code in the slide.htt to make it work
Even with the code installed I saw 2 requests on my webserverlog - 1 for the preload and a new one with the load of the next slide
First you have the browser settings and how it uses "temporary internet files".
In IE6 check via : Extra - options - temporary internet files - settings
Here one can set when IE6 needs to check for new version of the pages (allways - when IE starts - automatically - never).
My settings were automatically and it did not work
Only after switching it to never the image was not reloaded (proof of functionality for the preload code), but this was not an option for me.
So that's how I discovered that you also need to play with the settings on your webserver
After adding this code in my .htaccess
ExpiresByType image/jpg A900
ExpiresByType image/jpeg A900
My browser(IE6) started to reuse the preloaded image and browsing my albums became faster