Help with remote screen sharing problem

First of all, i am new so i would like to say hi. Second of all, not 100% sure if this is the correct topic/place to be posting, but it kinda seemed like the best place to put it. Ok, now for the problem. I am out of town and i took my travel book, aka a macbook white running leopard. my computer at home is a imac with leopard and the screen sharing option in the preferences is on. I left it on for torrents and it never goes to sleep. i know the global ip of my home computer from one of those whats my ip sites, and i also know the local ip adress. Nobody is home, and i was wondering if anybody had any ideas on how i could screen share so i can access the files that i need that are on my computer at home from my computer that is with me. It is slightly imparitive that i get those files or at least see whats in them. Any ideas or help or anything would be greatly appreciated. Thanks!