Check this site out BeatEczema.com and try to close your browser. If you click on cancel, it actually redirects you to another page How can you do that?
This might help: http://usefulscripts.wordpress.com/2007/10/16/window-onbeforeunload-javascript-code/
No. It's evil, evil, evil. Call me old fashioned, but I want my back button to work, to not be prompted to bookmark a page and to be able to close my own browser when I want to. Also, I am pretty sure all of those are in the Geneva Convention.