Just include the jQuery library and SmoothAnchors.js, then add $().SmoothAnchors();
to your $(document).ready()
function.
<script type="text/javascript" src="jquery.min.js"></script>
<script type="text/javascript" src="SmoothAnchors.js"></script>
<script type="text/javascript">
$(document).ready(function() {
$().SmoothAnchors();
});
</script>
Here's a demo of the plugin in action: http://alextrob.github.io/SmoothAnchors/