// Rotate.js
function makeHttpRequest(url, callback_function, return_xml) {
   var http_request = false;

   if (window.XMLHttpRequest) { // Mozilla, Safari,...
		 http_request = new XMLHttpRequest();
		 if (http_request.overrideMimeType) {
			 http_request.overrideMimeType('text/xml');
		 }
   } else if (window.ActiveXObject) { // IE
		 try {
			 http_request = new ActiveXObject("Msxml2.XMLHTTP");
		 } catch (e) {
			 try {
				 http_request = new ActiveXObject("Microsoft.XMLHTTP");
			 } catch (e) {}
		 }
   }
   if (!http_request) {
		 alert('Unfortunately your browser doesn\'t support this feature.');
		 return false;
   }
   http_request.onreadystatechange = function() {
		 if (http_request.readyState == 4) {
			 if (http_request.status == 200) {
				 if (return_xml) {
					 eval(callback_function + '(http_request.responseXML)');
				 } else {
					 eval(callback_function + '(http_request.responseText)');
				 }
			 } else {
				 alert('There was a problem with the request.(Code: ' + http_request.status + ')');
			 }
		 }
   }
   http_request.open('GET', url, true);
   http_request.send(null);
}

function loadBanner(xml) {
	var html_content = xml.getElementsByTagName('content').item(0).firstChild.nodeValue;
	var reload_after = xml.getElementsByTagName('reload').item(0).firstChild.nodeValue;
	document.getElementById('ajax-banner').innerHTML = html_content;

	try {
		clearTimeout(to);
	} catch (e) {}
	to = setTimeout("nextAd()", parseInt(reload_after));
}

function nextAd() {
	var now = new Date();
	var url = 'ajax-banner.php?ts=' + now.getTime();
	makeHttpRequest(url, 'loadBanner', true);
}

window.onload = nextAd;