大家帮忙看看这段代码哪里错了?

Question

这段JS代码为什么我数据写不进去啊?
function createXMLHttpRequest() {
  var xmlreq = false;
  if (window.XMLHttpRequest) {
    xmlreq = new XMLHttpRequest();
  } 
  else if (window.ActiveXObject) {
    try {      
      xmlreq = new ActiveXObject("Msxml2.XMLHTTP");      
    } catch (e1) {
    
    try {        
      xmlreq = new ActiveXObject("Microsoft.XMLHTTP");
    } catch (e2) {
        xmlreq = false;
    }
   }
  }
return xmlreq;
}
function getReadyStateHandler(req, responseXmlHandler) {
    return function () {
     if (req.readyState == 4) {       
        if (req.status == 200) {
           responseXmlHandler(req);
        } else {
            alert("HTTP error "+req.status+": "+req.statusText);
        }
      }
    }
 }
 
function init(req){
req.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
 }function doNothing(req)
{
alert(req.reponseText); 
}function toAaaHTTP(){
var form = document.all["tranCustomsSealExamingForm"];
  var str = "customShip="+form.all["customShip"].value;
  str += "&customDest="+form.all["customDest"].value;
  str += "&driverNO="+form.all["driverNO"].value;
 
  return str;
}function doSubmit()
{
var form = document.all["tranCustomsSealExamingForm"];
if(form.all["v_checkbox"].checked==true)
{
createXMLHttpRequest();
req.onreadystatechange  = getReadyStateHandler(req, doNothing);
req.open("POST", "tranCustomInspectReport.do", true);
init(req);
  req.send(toAaaHTTP()); 
 
}
  return true;
}