load-template.js

// lazy loading and caching templates
// callback receives rendered html - can write to the DOM or whatnot

var TMPL_PREFIX = 'tmpl.'

function renderTemplate(callback, identifier, data) {
    // check localStorage for identifier
    var data = data || {},
        key = TMPL_PREFIX + identifier,
        url = 'templates/' + identifier + '.mustache',
        tmpl;

    if (tmpl = window.localStorage.getItem(key)) {
        callback(Mustache.to_html(tmpl, data));
    } else {
        x$().xhr(url, function () {
            var tmpl = this.responseText;

            window.localStorage.setItem(key, tmpl);
            callback(Mustache.to_html(tmpl, data));
        });
    }
}