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, false);
		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, false);
			pos.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
      pos.send(posData);
    }
  }
}

function grabPosXML(tagName) {
	//alert(tagName);
	return pos.responseXML.documentElement.getElementsByTagName(tagName)[0].childNodes[0].nodeValue;
}