function addLoadEvent(func) {
    var oldonload = window.onload;
    if (typeof window.onload != 'function') {
        window.onload = func;
    }
    else {
        window.onload = function() {
            if (oldonload) {
                oldonload();
            }
            func();
        }
    }
}

addLoadEvent(function(){
 // Insertamos el Código que Google Analytics
 var analyticsCode = 'UA-3971215-2';

 var s = document.createElement("script");
 s.type = "text/javascript";
 s.src = "http://www.google-analytics.com/ga.js";
 s.onload = s.onreadystatechange = function() {
	if (typeof _gat  == 'object'){
            var pageTracker = _gat._getTracker(analyticsCode);
            pageTracker._initData();
            pageTracker._trackPageview();
         }
 }
 document.getElementsByTagName("head")[0].appendChild(s);
});