loadTemplate.js

var loadTemplate = function (path, callback, asElement) {
    /*
     * Carrega um template Mustache remoto.
     */
    var request = window.XMLHttpRequest ?
                  new XMLHttpRequest() :
                  new ActiveXObject('Microsoft.XMLHTTP');

    request.addEventListener('load', function () {
        var templateContent = this.responseText,
            wrapper = document.createElement('div');

        Mustache.parse(templateContent);
        wrapper.innerHTML = templateContent;

        if (asElement)
            callback(wrapper.firstChild);
        else
            callback(templateContent);
    });

    request.open('GET', path);
    request.send();
};