Writing JavaScript is awesome.
It is so simple, yet powerful. And if you add jQuery, it just makes me happy!

But there is a problem in here. There is no compiler for JavaScript, once I spent over 4 hours over a bug to find a 'd' character lost in one of the files.
Not today. Today I got this:

http://james.padolsey.com/javascript/jquery-lint/

It will be in every single  site I do from now on.
And I strongly recommend you do the same.

This is not the only option, you can look for others, but most of them are online analyzers, and I think this one is easier to run, you just have to link it (and jQuery, silly)

<script src="jquery.js"></script>
<script src="jquery.lint.js"></script>

easy as Π 

Got it?

nerd!