Preload external jpgs as a group

I’m useless at AS (incase my last 10 posts didn’t make that clear!)can someone tell me what code to use if i want to preload a bunch of dynamically loaded jpgs

there are 4 child swfs with 9 thumbnails each -
would love to know how i can preload 9 images at a time
say when a user selects the 1st thumbnail of a group

they are all saved in one images folder