Who needs fancy javascript templating languages when a good old 10-liner does the job.

javascript templating

<div id="output"></div>
<script type="text/html" id="greeting-template">
	<div class="greeting">
		Hello, {{ name }}!
	</div>
</script>
<script>
	function template(id, params) {
		var html = document.getElementById(id).innerHTML
		for (var key in params) {
			var search = '{{ '+key+' }}'
			while (html.match(search))
			html = html.replace(search, params[key])
		}
		return html
	}

	var el = document.getElementById('output')
	el.innerHTML = template('greeting-template', { name:'Templated World' })
</script>

In action: http://jsfiddle.net/DvJyV