jquery add a new html element based on a template with variables
<script id="hidden-template" type="text/x-custom-template">
<tr>
<td>Foo</td>
<td>Bar</td>
<tr>
</script>
then in javascript:
var template = $('#hidden-template').html();
// the following line is to set some value in the template
// if the template code is static you can skip the following line
template.find('#en-element-to-set-its-value').html("<p>This is the new value</p>");
$('button.addRow').click(function() {
$('#targetTable').append(template);
});