You can achieve it like this:
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.2.6/jquery.min.js"></script>
<script>
window.jQuery || document.write('<script src="/path/to/your/jquery"><\/script>');
</script>
This should be in your page’s <head>
and any jQuery ready event handlers should be in the <body>
to avoid errors (although it’s not fool-proof!).
One more reason to not use Google-hosted jQuery is that in some countries, Google’s domain name is banned.