var xmlhttp;

function updateImage(div_id, photo, array_no) {
	xmlhttp = GetXmlHttpObject();
	if (xmlhttp == null) {
		alert("Browser does not support HTTP Request");
		return;
	}
	var url = "http://www.gass-hh.de/templates/gass/includes/updateImage.ajax.php";
	url = url + "?div_id=" + div_id; //div to update
	url = url + "&photo=" + photo; //photo to load
	url = url + "&array_no=" + array_no; // to determain the next and previous image
	url = url + "&sid=" + Math.random();
	
	xmlhttp.onreadystatechange = stateChanged;
	xmlhttp.open("GET", url, true);
	xmlhttp.send(null);
	xmlhttp.div_id = div_id;
}

function stateChanged() {
	if (xmlhttp.readyState == 4) {
		var div_id = this.div_id;
		document.getElementById(div_id).innerHTML = xmlhttp.responseText;
	}
}

function GetXmlHttpObject() {
	if (window.XMLHttpRequest) {
		// code for IE7+, Firefox, Chrome, Opera, Safari
		return new XMLHttpRequest();
	}
	if (window.ActiveXObject) {
		// code for IE6, IE5
		return new ActiveXObject("Microsoft.XMLHTTP");
	}
	return null;
}