function createHttpRequest() {

 if(window.ActiveXObject) { //for Windows IE
  try {
   return new ActiveXObject("Msxml2.XMLHTTP") //MSXML2 and above
   } catch (e) {
  try {
   return new ActiveXObject("Microsoft.XMLHTTP") //old MSXML
   } catch (e2) {
   return null
   }
  }
 }
 else if(window.XMLHttpRequest){  //Win ie以外のXMLHttpRequestオブジェクト実装ブラウザ用
  return new XMLHttpRequest();
 }
 else {
  return null
 }
}

function sendRequest (uri, rest) {//method, data, async, modId
 var method = rest.method? rest.method : 'GET';
 var async  = rest.async?  rest.async  : true;
 var data   = rest.data;
 var modId  = rest.modId;
 
/*
 if (typeof(async) != 'string') {
  async = true;
 }
 if (typeof(method) != 'string') {
  method = 'GET';
 }
*/

 var httpObj = createHttpRequest();
 httpObj.open(method, uri, async);

 httpObj.onreadystatechange = function() { 
  if (httpObj.readyState == 4) { 
   on_loaded(httpObj, modId);
  }
 }
    
 httpObj.send(data);
}

function on_loaded(obj, modId) {
 $(modId).innerHTML = obj.responseText;
}
  
/*

USAGE:
var data = sendRequest('/cgi/test.cgi', {modId:'testid'}); 

sendRequest('/cgi/test.cgi', { modId:'testid', method:'GET', async:true, data:null }); 
and element testid will be replaced by '/cgi/test.cgi';

*/