// global flag
var isIE = false;

// 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) {
    // branch for native XMLHttpRequest object
    if (window.XMLHttpRequest) {
        req = new XMLHttpRequest();
        req.onreadystatechange = processReqChange;
        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 = processReqChange;
            req.open("GET", url, true);
            req.send();
        }
    }
}

// handle onreadystatechange event of req object
function processReqChange() {
    // only if req shows "loaded"
    if (req.readyState == 4) {
        // only if "OK"
        if (req.status == 200) {
             buildTopicList();
         } else {
            alert("There was a problem retrieving the XML data:\n" +
                req.statusText);
         }
    }
}


// retrieve text of an XML document element, including
// elements using namespaces
function getElementTextNS(prefix, local, parentElem, index) {
    var result = "";
    if (prefix && isIE) {
        // IE/Windows way of handling namespaces
        result = parentElem.getElementsByTagName(prefix + ":" + local)[index];
    } else {
        // the namespace versions of this method 
        // (getElementsByTagNameNS()) operate
        // differently in Safari and Mozilla, but both
        // return value with just local name, provided 
        // there aren't conflicts with non-namespace element
        // names
        result = parentElem.getElementsByTagName(local)[index];
    }
    if (result) {
        // get text, accounting for possible
        // whitespace (carriage return) text nodes 
        if (result.childNodes.length > 1) {
            return result.childNodes[1].nodeValue;
        } else {
            return result.firstChild.nodeValue;    		
        }
    } else {
        return "n/a";
    }
}


// fill Topics select list with items from
// the current XML document
function buildTopicList() {
    var items = req.responseXML.getElementsByTagName("item");
var html = "";
    for (var i = 0; i < items.length; i++) {
	var title = getElementTextNS("", "title", items[i], 0);
	var date = getElementTextNS("", "pubDate", items[i], 0);
date = date.substring(date.indexOf(" ") + 1); 
var pre = date.substring(0, date.indexOf("200") - 1) + ", ";
var sub = date.substring(date.indexOf("200"), date.indexOf("200") + 4);
date = pre + sub;
	var link = getElementTextNS("", "link", items[i], 0);
        html += "<tr><td>กค<a href=" + link + " target=_blank>" + title  + "</a>&nbsp;[" + date + "]</td></tr>";
	if(i == 3) break;
    }
    document.getElementById("topic_span").innerHTML =  "<table cellpadding='0' cellspacing='0' border='0' width='95%' align='center'>" + html + "</table>";
}