Optimized Script for loading User Voice Script

gistfile1.js

/* Optimized Script for loading User Voice Script
 * Based on idea by kangax @ http://gist.github.com/381634
 */
var uservoiceOptions = {
  /* ... */
};

//Using `self` rather than `window` to prevent cross-domain issues when used in iframe
self.onload = (function (w, d, t) {
    var _loadUserVoice = function () {
        var s = d.getElementsByTagName(t)[0],
            UV = d.createElement(t);
        UV.async = !0;
        UV.src = '//cdn.uservoice.com/javascripts/widgets/tab.js';

        s.parentNode.insertBefore(UV, s);
    }, original = w.onload;

    if(typeof original === 'function') {
        return function () {
            original();
            _loadUserVoice();
        };
    }

    return _loadUserVoice;
}(self, document, 'script'));