here's a source code encrypter (compatible with all browsers) i use from dynamicdrive.com: http://dynamicdrive.com/dynamicindex9/encrypter.htm

here's what they have to say about it:

Description: Scramble the source of any chunk of code, or the entire webpage, using this creative script. The encrypted code will still be interpreted properly by the browser, just difficult for us humans to read.

It is recommended that you use this script to encrypt only the part(s) of your webpage that require encryption (ie: a script), rather than the entire page. This helps minimize the chance of any problems.