// This script establishes and handles dynamic Ajax calls
// You must define:
/*
function processReqChange() {
    // only if req shows "loaded"
    if (req.readyState == 4) {
        // only if "OK"
        if (req.status == 200) {
            // ...processing statements go here...
        } else {
            alert("There was a problem retrieving the XML data:\n" +
                req.statusText);
        }
    }
}
*/

var isIE = false; /* Also applies to Fx3 */

// global request and XML document objects
var req;

// retrieve XML document (reusable generic function);
// parameter is URL string (relative or complete) to
// an .xml file whose Content-Type is a valid XML
// type, such as text/xml; XML source must be from
// same domain as HTML file
function loadXMLDoc(url, process_fn) {
	// branch for native XMLHttpRequest object
	if (window.XMLHttpRequest) {
		if(document.all) isIE=true;
		if(navigator.oscpu && document.getElementsByClassName) isIE=true;
			req = new XMLHttpRequest();
			req.onreadystatechange = process_fn;
			req.open("GET", url, true);
			req.send(null);
	// branch for IE/Windows ActiveX version
	} else if (window.ActiveXObject) {
			isIE = true;
			req = new ActiveXObject("Microsoft.XMLHTTP");
			if (req) {
					req.onreadystatechange = process_fn;
					req.open("GET", url, true);
					req.send();
			}
	}
}

// This function is used to extract XML data from the returned AJAX string (in XML format)
function getElementTextNS(prefix, local, parentElem, index) {
    var result = "";
		
	if (window.XMLHttpRequest) {
		if(document.all) isIE=true;
		if(navigator.oscpu && document.getElementsByClassName) isIE=true;
	} else if (window.ActiveXObject) {
			isIE = true;
	}
   
    // IE/Windows way of handling namespaces
    if (prefix && isIE) 
      result = parentElem.getElementsByTagName(prefix + ":" + local);
		else 
		  result = parentElem.getElementsByTagName(local);
    if (result.length>0) 
		{
			var node=result[index];
      // get text, accounting for possible
      // whitespace (carriage return) text nodes 
      if (node.childNodes.length > 1)
        return node.childNodes[1].nodeValue;
      else 
        return node.firstChild.nodeValue;    		
    } 
		else return "";   /* n/a */
}