var pos; // variable for posting information
function loadXMLPosDoc(url,posData) {
    // branch for native XMLHttpRequest object
    if (window.XMLHttpRequest) {
        pos = new XMLHttpRequest();
        pos.onreadystatechange = processPosChange;
        pos.open("POST", url,true);
		pos.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
        pos.send(posData);
    // branch for IE/Windows ActiveX version
    } else if (window.ActiveXObject) {
        pos = new ActiveXObject("Microsoft.XMLHTTP");
        if (pos) {
            pos.onreadystatechange = processPosChange;
            pos.open("POST", url,true);
			pos.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
            pos.send(posData);
        }
    }
}

function grabPosXML (tagName) {
	if (!pos.responseXML) return false;
	var ns = pos.responseXML.documentElement.getElementsByTagName(tagName);
	if (ns && ns[0] && ns[0].childNodes && ns[0].childNodes[0]) 	
		return ns[0].childNodes[0].nodeValue;
	else return false;
}

function processPosChange() {
  // page loaded 'complete'
  if (pos.readyState == 4) {
    // page is 'OK'
    if (pos.status == 200) {
      finish();
    } else {
	  alert('Oops! Something unexpected happened.');
	  finishFail(pos.status);
	}
  }
}