<script type=&hellip;></script> works but javascript_include_tag doesn"t

I put jquery.validate.js in my public/javascript folder and I called

<%= javascript_include_tag 'jquery.validate' %>

in the header but I get this in the chrome debugger:

Uncaught TypeError: Object [object Object] has no method 'validate'

I can see jquery.validate.js?1317943298 under javascripts/ in the chrome debugger.

On the other hand, when I add this right before I call validate(),

<script type="text/javascript" src="http://jzaefferer.github.com/jquery-validation/jquery.validate.js"></script>

it works. I see jquery.validate.js under jquery-validation/ as well as jquery.validate.js?1317943298 under javascripts/ in the chrome debugger. Both files are identical.

What's going on here?