Valid Characters for JavaScript Variable Names
<p>Just wondering if anyone can point me to a webpage detailing the valid characters that can be used for naming a JavaScript variable.  </p>

<p>I want to create a small 'extension library' for my non-javascript users here at work (who all seem to be squeamish when it comes to the language).  I love how jQuery and Prototype have both used the '$' dollar sign, and since I use jQuery, I'm looking for another nice one character symbol to use.  </p>

<p>I realize that I could just test out a number of characters, but I'm posing this question to the JavaScript Sensi's of the world to give me advice about what characters (even if valid) would be a bad idea to use (perhaps for future integration with another popular library).</p>
