var userAgent = { };

userAgent.isAJAX  = (createXMLHttpRequest()?true:false);
userAgent.isMozilla  = (navigator.userAgent.match(/\bGecko\b/));
userAgent.isOpera  = (navigator.userAgent.match(/\bOpera\b/));
userAgent.isInternetExplorer = (navigator.userAgent.match(/\bMSIE\b/) && !userAgent.isOpera);

function createXMLHttpRequest() {
  var xmlReq = false;
    // branch for native XMLHttpRequest object
  if(window.XMLHttpRequest) {
   try {
         xmlReq = new XMLHttpRequest();
       } catch(e) {
         xmlReq = false;
                  }
    // branch for IE/Windows ActiveX version
  } else if(window.ActiveXObject) {
   try {
        xmlReq = new  ActiveXObject("Msxml2.XMLHTTP");
       } catch(e) {
      try {
           xmlReq = new  ActiveXObject("Microsoft.XMLHTTP");
          } catch(e) {
                      xmlReq = false;
		     }
	          }
	 	 	          }
  return xmlReq;
}

function callServer(method, url, data, dataType, func, arg, params, async) {
 if (!method) method='GET';
 if (!async) async=true;
 var xmlReq = createXMLHttpRequest();
 if(xmlReq) {
  xmlReq.onreadystatechange = function() {
   if (xmlReq.readyState == 4) {
    func(arg, xmlReq.responseText, xmlReq.responseXML, xmlReq.status, xmlReq.statusText, params);
   }
  };
  xmlReq.open(method, url, async);
  if (data) {
   if (!dataType) dataType='application/x-www-form-urlencoded';
   if (typeof(data)!="string" && dataType.indexOf("charset=")<0 && userAgent.isMozilla) dataType=dataType+';charset=utf-8';
   xmlReq.setRequestHeader('Content-Type', dataType);
  }
  xmlReq.send(data);
  return false;
 }
 return true;
}

function showHTML(element, responseText, responseXML, statusCode, statusText, params) {
  if (typeof(element)=="string")
   element=document.getElementById(element);
  if (statusCode==200 || statusCode==201) {
    element.innerHTML=responseText;
  }
    else {
	    alert("Download fail: "+statusText);
         }
}

function showNothing(element, responseText, responseXML, statusCode, statusText, params) {}