var XMLHttpRequestObject = false;

if (window.XMLHttpRequest) {
    XMLHttpRequestObject = new XMLHttpRequest();
} else if (window.ActiveXObject) {
	XMLHttpRequestObject = new ActiveXObject("Microsoft.XMLHTTP");
}

function pobierz(testimonial) {

    if (XMLHttpRequestObject) {
        var dest = "testimonial";
        var div = document.getElementById(dest);
        var url = "_inc/testimonial.php?content_id=" + testimonial;

        XMLHttpRequestObject.open("GET", url);
		XMLHttpRequestObject.onreadystatechange = function() {
			if (XMLHttpRequestObject.readyState == 4 && XMLHttpRequestObject.status == 200) {
				var str = "";
				str += XMLHttpRequestObject.responseText;
				div.innerHTML = str;
			}
		}
		XMLHttpRequestObject.send(null);
	}

setTimeout('pobierz('+testimonial+')',5000);
}