To make the link dynamic is pretty easy, this should do what you need:
<script type="text/javascript">
function getMonthFile() {
var months = new Array(12);
today = new Date();
months[0] = "Jan";
months[1] = "Feb";
months[2] = "Mar";
months[3] = "Apr";
months[4] = "May";
months[5] =...