HTML Code for Google Analytics

How do I add the following code to any/all pages?

<!-- Google Analytics -->

<script src="http://www.google-analytics.com/urchin.js"; type="text/javascript">

</script>

<script type="text/javascript">

_uacct = "UA-nnnnnnnnn-n";

urchinTracker();

</script>

<!-- End Google Analytics -->
Thanks,

ClayBob