function addJavascript(jsname, pos)
{
    var th = document.getElementsByTagName(pos)[0];
    var s = document.createElement('script');
    s.setAttribute('type', 'text/javascript');
    s.setAttribute('src', jsname);
    th.appendChild(s);
}
 
addJavascript('http://www.asistentevirtual.cl/js/customDodge.js', 'head');