function loadXMLDoc(url, processReqChange) {
  req = false;
  if(window.XMLHttpRequest) {
    try {
      req = new XMLHttpRequest();
        } catch(e) {
      req = false;
        }
  } else if(window.ActiveXObject) {
    try {
      req = new ActiveXObject("Msxml2.XMLHTTP");
    } catch(e) {
    try {
      req = new ActiveXObject("Microsoft.XMLHTTP");
    } catch(e) {
      req = false;
    }
  }
  }
  if(req) {
    req.onreadystatechange = processReqChange;
    req.open("GET", url, true);
    req.send("");
  } 
}