if( typeof XMLHttpRequest == "undefined" )
  XMLHttpRequest = function() {
    try { return new ActiveXObject("Msxml2.XMLHTTP.6.0") } catch(e) {}
    try { return new ActiveXObject("Msxml2.XMLHTTP.3.0") } catch(e) {}
    try { return new ActiveXObject("Msxml2.XMLHTTP") }     catch(e) {}
    try { return new ActiveXObject("Microsoft.XMLHTTP") }  catch(e) {}
    throw new Error( "This browser does not support XMLHttpRequest or XMLHTTP." )
  };

var oaj = new XMLHttpRequest();

function ajpostrequest(url, vars, callbackFunction) {
  var request =  new XMLHttpRequest();
  request.open("POST", url, true);

  request.setRequestHeader("Content-Type",
                           "application/x-javascript;");
 
  if (callbackFunction)
    request.onreadystatechange = function() {
      if (request.readyState == 4 && request.status == 200) {
        if (request.responseText) {
          callbackFunction(request.responseText);
        }
      }
    };

  request.send(vars);
}