I needed to provide a different template depending on the type of activity selected in a drop-down menu. The following jQuery code gets the template name from the drop-down value and updates the href target.
jQuery("#selectDivSetType").change(function () {
var strTemplateName = $('#selectDivSetType').val();
var strTemplateURI = './templates/' + strTemplateName;
$('#templateURI').attr("href", strTemplateURI);
});