If you spend alot of time looking at and comparing pictures, or flip back and forth between a bunch of different pages or sites, Mozilla Firefox is a free web browser that allows tabbed windows. You can just control click on challenge pics and it loads them in the background on separate tabbed windows. It's a real time saver for dial-up folk, and it supposedly doesn't have alot of the security holes that Explorer has.

http://www.mozilla.org/products/firefox/

I like Firefox a lot. I switched completely over to it as my primary browser until the last version (it's still in beta) when new problems and its clumsy handling of bookmarks forced me to switch back to IE6. But it's due to reach v1.0 in a couple of months, and I'll switch back in a heartbeat if they fix it.