// 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) {
            //clearTopicList();
            buildTopicList();
         } else {
            alert("There was a problem retrieving the XML data:\n" +
                req.statusText);
         }
    }
}

// invoked by "Category" select element change;
// loads chosen XML document, clears Topics select
// element, loads new items into Topics select element
function loadDoc(feedUrl) {

	loadXMLDoc(feedUrl);
}

// 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";
    }
}

// empty Topics select list content
function clearTopicList() {
    var select = document.getElementById("topics");
    while (select.length > 0) {
        select.remove(0);
    }
}

// add item to select element the less
// elegant, but compatible way.
function appendToSelect(select, value, content) {
    var opt;
    opt = document.createElement("option");
    opt.value = value;
    opt.appendChild(content);
    select.appendChild(opt);
}

// fill Topics select list with items from
// the current XML document
function buildTopicList() {
   // var select = document.getElementById("topics");
   // var items = req.responseXML.getElementsByTagName("item");
    // loop through <item> elements, and add each nested
    // <title> element to Topics select element
   // for (var i = 0; i < items.length; i++) {
   //     appendToSelect(select, i,
   ////         document.createTextNode(getElementTextNS("", "title", items[i], 0)));
    //}
    // clear detail display
   // document.getElementById("details").innerHTML = "";
	
	//new stuff
	x=req.responseXML.getElementsByTagName("title");
	lnk=req.responseXML.getElementsByTagName("link");

	for (i=0;i<x.length;i++)
	  { 
	  //document.write("<a href=\""+lnk[i].childNodes[0].nodeValue+"\">"+x[i].childNodes[0].nodeValue+"</a>");
	  tickerLines[i]=x[i].childNodes[0].nodeValue;
	  tickerLinks[i]=lnk[i].childNodes[0].nodeValue;
	  }

	tickinit();

	
}

// display details retrieved from XML document
function showDetail(evt) {
    evt = (evt) ? evt : ((window.event) ? window.event : null);
    var item, content, div;
    if (evt) {
        var select = (evt.target) ? evt.target : ((evt.srcElement) ? evt.srcElement : null);
        if (select && select.options.length > 1) {
            // copy <content:encoded> element text for
            // the selected item
            item = req.responseXML.getElementsByTagName("item")[select.value];
            content = getElementTextNS("content", "encoded", item, 0);
            div = document.getElementById("details");
            div.innerHTML = "";
            // blast new HTML content into "details" <div>
            div.innerHTML = content;
        }
    }
}

var tickerLines= new Array();
var tickerLinks= new Array();
var tickerLineChars = new Array();
var tickerLineInProcess ='';
//xmlDoc=loadXMLDoc("sports2.xml");

var ie = document.all ? true : false;
var first = true;
var tickCount=2;
var tickCharCount=0;

var intervalID;
function tickinit() {
	
	tickerLineInProcess='';
	var myStr=tickerLines[tickCount];
	tickCharCount=0;
	//set up char arrray
	for(j=0;j<myStr.length;j++)
		{
			tickerLineChars[j]=myStr.charAt(j);
		}
	//add 3 spaces to end of each line
	for(k=0;k<8;k++)
	{
		tickerLineChars[j+k]='.';
	}
	intervalID=setInterval('tick()', 100);
}

function tick() {

	if (tickCharCount==tickerLineChars.length)
	{
		//got to the end of a line
		tickCount++;
		tickerLineInProcess='';
		tickerLineChars=new Array();
		if(tickCount==tickerLines.length){
			tickCount=2;// start from beginning of list of items			
		}
		var myStr=tickerLines[tickCount];
		
		tickCharCount=0;
		//set up char arrray
		for(j=0;j<myStr.length;j++)
			{
				tickerLineChars[j]=myStr.charAt(j);
			}
		//add 3 spaces to end of each line
		for(k=0;k<8;k++)
		{
			tickerLineChars[j+k]='.';
		}
	}
		
	//tick 2
	tickerLineInProcess=tickerLineInProcess+tickerLineChars[tickCharCount]
	document.getElementById("ticktext2").innerHTML="<a style=\"display:block;\" href=\""+tickerLinks[tickCount]+"\" target=\"_blank\">"+tickerLineInProcess+"</a>";
	tickCharCount++;
	first = false;
	
}
function stopTick()
{
	clearInterval(intervalID);
}
function restartTick()
{
	intervalID=setInterval('tick()', 150);
}