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var jsonObj;
var xmlhttp = null;
function callAsync(url, callbackSuccess)
{
 xmlhttp = new Ajax();
 xmlhttp.open("GET", url, true);
 xmlhttp.onreadystatechange=function()
 {
  // readyState = 4 ; "complete"
  if (xmlhttp.readyState==4)
  {
   // status = 200 ; "ok"
   if(xmlhttp.status == 200)
   {
    uiManager.showNotification(1000, "ok", "Done");
    /*
     *  Remove the substr "jsonFlickrApi(" from the responseText
     */
    var text = xmlhttp.responseText;
    text = text.substr(14, text.length-15);
 
    // Create JSON Oject
    jsonObj = eval('(' + text + ')');
    
    callbackSuccess(jsonObj);
   }
   else
   {
    uiManager.showNotification(1000, "warning", "Failed to get data from server");
   }
  }
 }
 xmlhttp.send(null);
}


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//Õâ¸ö·½·¨½«Ê¹ÓÃXMLHTTPRequest¶ÔÏóÀ´½øÐÐAJAXµÄÒì²½Êý¾Ý½»»¥
var xmlhttp;
function verify() {
//0¡£Ê¹ÓÃdomµÄ·½Ê½»ñÈ¡Îı¾¿òÖеÄÖµ
//document.getElementById("userName")ÊÇdomÖлñÈ¡ÔªËØ½ÚµãµÄÒ»ÖÖ·½·¨£¬Ò»¸öÔªËØ½Úµã¶ÔÓ¦HTMLÒ³ÃæÖеÄÒ»¸ö±êÇ©£¬Èç¹û<input& ......

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function sendAsynchronRequest(url,parameter,callback){
 createXMLHttpRequest();
 if(parameter == null){
  xmlHttp.onreadystatechange = callback;
  xmlHttp.open("GET",url,true);//µ±GETÇëÇóʱ£¬ÔÚµØÖ·À¸ÖÐÊÇ´ø²ÎÊýµÄ£¬¶ø²ÎÊýΪNULL£¬ËùÒÔÓÃgetÇëÇó£¬send(null)
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