If you use JavaScript to redirect doorway pages or for XSS you should always obfuscate your JavaScript code. That’s why I decided to post this really easy to use JavaScript Obfuscator. (It’s just a friendlier version of this one.)
To use it you just need to input your javascript (without the <script></script> tags!) and click in the “Encode” button. It will obfuscate your code with two similar methods so you can choose and then… well that’s pretty much it!
DISCLAIMER: It’s really easy to “break” the obfuscation for people with JavaScript knowledge, but at least it will keep away n00bs.