Use cached version of jQuery if recent enough, otherwise download the latest
<p>Can I do the following to shave milliseconds of loading for some users?</p>

<p>Fix a suitable version <code>x</code> of jQuery, say <code>x = 1.4.1</code>, and find the most recent version <code>y</code> of jQuery cached by the user. Then,</p>

<pre><code>if (y &gt; x === true) {
     /* Use the cached version y of jQuery */
} else {
     /* Download and use the latest version of jQuery */
}
</code></pre>

<p>Also, would this be <em>advantageous</em>?</p>
