var adnumber = 2;

function show(whichOne){
	if(whichOne == 1){
		tDiv = "ajax-banner1";
		vDiv = "ajax-banner2";
	}else{
		tDiv = "ajax-banner2";
		vDiv = "ajax-banner1";
	}
	if($(tDiv).fx){
	$(tDiv).fx.stop();
	}
	if($(vDiv).fx){
	$(vDiv).fx.stop();
	}
	$(tDiv).fx = $(tDiv).effect('opacity', {duration: 2000}).start(0);
	$(vDiv).fx = $(vDiv).effect('opacity', {duration: 2000}).start(1);	
}

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('Unfortunatelly you 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(text)
{
    if (adnumber == 1) {
	    document.getElementById('ajax-banner1').innerHTML = text;
    } else {
        document.getElementById('ajax-banner2').innerHTML = text;
	}
    try {
        clearTimeout(to);
    } catch (e) {}
	show(adnumber)
    if (adnumber == 1) {adnumber = 2} else {adnumber=1}
    to = setTimeout("nextAd()", 5000);

}

function nextAd()
{
    var now = new Date();
    var url = '/ads/ad' + adnumber + '.xml?ts=' + now.getTime();
    makeHttpRequest(url, 'loadBanner', false);
}

function FirstTime()
{
    to = setTimeout("nextAd()", 5000);
}

window.onload = FirstTime;