The Using Javascript page in the Codex says to include common javascript files in your header.php file, but that means re-writing it whenever you change themes. I created a simple plugin that includes jQuery and ui.jquery on each page; it's

<?php
/*
Plugin Name: jQuery
Plugin URI: http://bililite.nfshost.com/blog/
Description: Includes the jQuery javascript framework (and the ui.jquery plugins) in your page, with some styling for <pre> elements
Author: Daniel Wachsstock
Version: 1.0
Author URI: http://bililite.nfshost.com/blog/
*/ 

function jQuery(){
echo '
   <script type="text/javascript" src="http://www.google.com/jsapi?key=apikey"></script>
   <script type="text/javascript">google.load("jquery","1");</script>
   <script type="text/javascript" src="http://ui.jquery.com/js/ui.js" ></script>
   <style>
      pre {
        background: #F4F4F4;
        border: 1px solid #B2B2B2;
        overflow: scroll;
      }
    </style>';
}

add_action('wp_head', 'jQuery');

?>

Replace apikey with your own Google API key.

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