cross-domain AJAX with dynamic script tag

This code is right from the book "High Performance JavaScript." It lets you do AJAX-like requests cross-domain, and since you can by-pass eval of JSON, by using P-JSON (padded JSON), it actually performs much faster than classic AJAX.

var loadScript = function(url, callBack){

    //create element
    var script = document.createElement("script");
    script.type = "text/javascript";
    if(script.readyState){ //for IE
        script.onreadystatechange = function(){
            if(script.readyState == "loaded" || script.readyState == "complete"){
                script.onreadystatechange = null;
    else{ //other browsers
        script.onload = function(){

    script.src = url;



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