function rotator(fileName) {

	var request = null;
	if(window.XMLHttpRequest) {
		request = new XMLHttpRequest();
	} else if (window.ActiveXObject) {
		request = new ActiveXObject("Microsoft.XMLHTTP");
	}
	
	request.open("GET", fileName);
	
	request.onreadystatechange = function() {
		if(request.readyState < 4) {
		} else if (request.readyState == 4) {
			changeBanner(request.responseText);
		}
	}
	request.send(null);
}

function changeBanner(numberBanners) {
	/*alert(numberBanners);*/
	bannerToShow = Math.floor((numberBanners)*Math.random())+1 ;
	/*alert(bannerToShow);*/
	document.getElementById("testata").style.backgroundImage = "url(assets/img/banner/testata-"+bannerToShow+".jpg)";
	
	/*alert("/assets/img/banner/testata-"+bannerToShow+".jpg")*/
}