In need of an encryption algorithm?

I need to encrypt a piece of text in JavaScript to be passed as a URL parameter and decrypted server-side.
Requirements are as follows:

1. Should be symmetric.
2. Should output a hex string
3. Should be easy to implement or have an open source implementation already.
4. Security requirements are minimal. More interested on speed.
5. Should have an equivalent library or be easy to implement in Java

Best candidate so far is blowfish.js from http://dren.ch/js_blowfish/ but I have not found an easy to use equivalent in Java.

Any suggestions ?

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