Setup

Add the tags to links(or maybe anything):

<a class="cws(C)">C</a>

Call the Script:

<script src="http://cws.danfolkes.com/cwsscript.js" type="text/javascript"></script>
<script>
cwsinit('ABCDEF1234');
</script>

Example:

cws(C,1)
cws(G) - Defaults to Chord
cws(Am) - Defaults to Chord