My Simple Ajax Util

I have been using a simple Ajax Util, for my Ajax calls for places where I just need simple AJAX calls and don't want to use any of the JS libs. This is how you use the Util

function ajexTest(){
var ajax = new AjaxUtil();
ajax.url= "http://www.google.com";
ajax.formObj=document.searchCustomerForm;
ajax.waitCallback = function(){
 //do something while waiting
}
ajax.scucessCallback = function(text){
 //do something on success
}
ajax.doPost();
}

And following is AjaxUtil code:

/**
*  Author:Anurag Kumar Jain
*  Date: July 11, 2007
**/

function AjaxUtil(){
//alert("creating AjaxUtil);
this.req=this.init();
this.url="";
this.parameters="";
this.async=true;
this.formObj;
this.scucessCallback=null;
this.ajaxCallback=null;
this.errorCallback2=null;
this.errorCallback=function(responseText){
 //alert(responseText);
 document.location.href = "error.jsp";
}
var me = this;
this.req.onreadystatechange = function() {
 //alert("in processRequest readyState = " + ajaxRequest.readyState);
 // readyState of 4 signifies request is complete
 if (me.req.readyState == 4) {
   // status of 200 signifies sucessful HTTP call
   //alert(ajaxRequest.responseText);
   if (me.req.status == 200) {
     //alert("ajax Callback Function is: " + ajaxCallback);
     //alert(me.req.responseText);
     //alert(me.req.status);
     if (me.scucessCallback) me.scucessCallback(me.req.responseText);
   }else{
     //alert(me.req.status);
     if(me.errorCallback) me.errorCallback(me.req.responseText);
     if(me.errorCallback2) me.errorCallback2(me.req.status, me.req.responseText);
   }
 }
}
}

AjaxUtil.prototype.init = function() {
//alert("initializting request");
if (window.XMLHttpRequest) {
     return new XMLHttpRequest();
} else if (window.ActiveXObject) {
     return new ActiveXObject("Microsoft.XMLHTTP");
}
};

AjaxUtil.prototype.doPost = function () {
//alert("in doPost");
//alert(this.url);
this.req.open("POST", this.url, this.async);
this.req.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
//req.setRequestHeader("Content-length", this.parameters.length);
//this.req.setRequestHeader("Connection", "close");
this.parameters+=getFormValues(this.formObj,null);
//alert(this.parameters);
//alert(this.url); alert(this.parameters);
this.req.send(this.parameters);
if(this.waitCallback) this.waitCallback();
};

AjaxUtil.prototype.doGet = function(){
//alert("in doGet");
//alert(this.url);
this.req.open("GET", this.url, this.async);
this.req.send(null);
if(this.waitCallback) this.waitCallback();
};

function getFormValues(fobj,valFunc){
var str = "";
var valueArr = null;
var val = "";
var cmd = "";
for(var i = 0;i < cmd =" valFunc" val =" eval(cmd)" str =" str.substr(0,(str.length">