I'm a designer looking for some help in making an external link alert page. I need to show users a disclaimer when they are leaving our site, and give them the option to turn back. I like how myspace does this with their External Link Alert page, but I'm not sure how to reproduce it. It looks like it's all JS but I can't figure out how to do it. If anyone knows how or has any other suggestions that would be great!

If you go here http://www.myspace.com/rachaelyamagata
and click on the image under the mailing list for the "Elepahants...Teeth singing into heart" album, you can see the page that I mentioned above

Thanks so much!