link directory...can someone make this?

[bigvin]

I need someones help. I want to do away with my thumbshots service and just have my own individual gif image for each of my links. I was thinking of creating a folder in images and take a screen shot of the homepage of each of my links and store them in lets say:
/images/links/
How can I do this where it will know what image to pickup for each of my urls? I'm guessing naming the image the url ....plus the extension .gif

......and for the record the reason I want to do away with the service is, thumbshots has been screwing around.....they give you a 5000 hit limit and then want you to upgrade to a pay service. They suspended my service until I upgrade. If I knew I was getting activity on my site, which I'm not, I would gladly pay for the service......but I know for a fact that I am not getting that type of activity with 10 - 12 active users. They must be counting the BOT and Spider hits.

Thanks and I appreciate if you could help me out.....just remember, I need baby steps...nothing overly technical please