There still are users who browse the Internet with the outdated Internet Explorer 6 browser..
Here’s a very useful tool to block this browser from showing your website’s content and force them to update.

The script prevents access to the site but the webpage is still visible in the background.
You can find/download the script at Google Code
Adding this script to your site is made by a single line of code:
I've disabled the scrolling because the original script blocks access to the loaded page but upon loading the whole page users can still scroll down.
PermalinkTags: IE6 Internet Explorer Google Code free stuff browser update