var req;

function getXHR() {
	if ( window.XMLHttpRequest ) {
		req = new XMLHttpRequest();
		return true;
	} else try {
		req = new ActiveXObject('Msxml2.XMLHTTP');
		return true;
	} catch(e) {
		try {
			req = new ActiveXObject("Microsoft.XMLHTTP");
			return true;
		} catch(e) {
			req = false;
			return false;
		}
	}
}


function GetXmlHttpObject(){
	var xmlHttp=null;
	try {
		// Firefox, Opera 8.0+, Safari
		xmlHttp=new XMLHttpRequest();
	} catch (e) {
		// Internet Explorer
		try {
			xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
		} catch (e) {
			xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
		}
	}
	return xmlHttp;
}


function updateElm(url, id) {
	if ( getXHR() ) {
		document.getElementById(id).innerHTML = '<img src="presentation/ajax.gif" width="15" height="15" class="ajax-updater" />';
		req.open( 'POST', url, true );
		req.onreadystatechange = function() {
			if ( req.readyState == 4) {
				if ( req.status==200) {
					document.getElementById(id).innerHTML = req.responseText;
				} else {
					document.getElementById(id).innerHTML = 'Could not retrieve data';
				}
			}
		}
		req.send('');
	}
	else return true;
	return false;
}


function updateSchedule(url, id) {
	portfolioReq=GetXmlHttpObject();
	if (portfolioReq==null){
 		document.getElementById(id).innerHTML = '<div class="ajax-loader"><p>Sorry the schedule will not load.</p></div>';
 		return;
 	} 
	portfolioReq.open( 'POST', url, true );
	portfolioReq.onreadystatechange = function() {
		if ( portfolioReq.readyState == 4) {
			if ( portfolioReq.status==200) {
				document.getElementById(id).innerHTML = portfolioReq.responseText;
			} else {
				document.getElementById(id).innerHTML = '<div class="ajax-loader"><p>Sorry the schedule will not load.</p></div>';
			}
		}
	}
	portfolioReq.send('');
}


function updateNowPlaying(url, id) {
	newsReq=GetXmlHttpObject();
	if (newsReq==null){
 		document.getElementById(id).innerHTML = '<div class="ajax-loader2">Sorry the now playing list will not load.</p></div>';
 		return;
 	} 
	newsReq.open( 'POST', url, true );
	newsReq.onreadystatechange = function() {
		if ( newsReq.readyState == 4) {
			if ( newsReq.status==200) {
				document.getElementById(id).innerHTML = newsReq.responseText;
			} else {
				document.getElementById(id).innerHTML = '<div class="ajax-loader2"><p>Sorry the now playing list will not load.</p></div>';
			}
		}
	}
	newsReq.send('');
}