var http = createRequestObject();
var objectId = '';

function createRequestObject(htmlObjectId){
  var obj;
  var browser = navigator.appName;

  objectId = htmlObjectId;

  if(browser == "Microsoft Internet Explorer"){
    obj = new ActiveXObject("Microsoft.XMLHTTP");
  } else {
    obj = new XMLHttpRequest();
  }
  return obj;
}

function sendReq(serverFileName, variableNames, variableValues) {
  var paramString = '';

  variableNames = variableNames.split(',');
  variableValues = variableValues.split(',');

  for(i=0; i<variableNames.length; i++) {
    paramString += variableNames[i]+'='+variableValues[i]+'&';
  }
  paramString = paramString.substring(0, (paramString.length-1));

  if (paramString.length == 0) {
    http.open('get', serverFileName);
  } else {
    http.open('get', serverFileName+'?'+paramString);
  }
  http.onreadystatechange = handleResponse;
  http.send(null);
}

function handleResponse() {
  if(http.readyState == 4){
    responseText = http.responseText;
    document.getElementById(objectId).innerHTML = responseText;
  }
}