Dynamic loading of JS with mobile API.

gistfile1.js

(function () {
    'use strict';

    var head, script, siteid, domain, internal, mobilesite;

    siteid = 20755;
    domain = new RegExp('jimmcnatttoyota.com', 'i');
    mobilesite = 'http://m.jimmcnatttoyota.com';

    head = document.getElementsByTagName('head')[0];
    script = document.createElement('script');
    internal = document.referrer.search(domain);

    script.type = 'text/javascript';
    script.src = 'http://api.handsetdetection.com/sites/js/' + siteid + '.js';

    if (internal === -1) {
        head.appendChild(script);
    }

    script.onload = function () {
        if (HandsetDetection.ismobile === true) {
            document.location = mobilesite;
        }
    };
}());