function createXMLHttpRequest()
{
var ajax_aktiv = window.setInterval("sendRequest()", 10000);
var ua;

if(window.XMLHttpRequest)
{
	try
	{
		ua = new XMLHttpRequest();
	} catch(e) {
		ua = false;
	}
	} else if(window.ActiveXObject)
	{
		try
		{
			ua = new ActiveXObject("Microsoft.XMLHTTP");
		} catch(e)
		{
			ua = false;
		}
	}
	return ua;
}

var req = createXMLHttpRequest();

function sendRequest()
{
	req.open('get', 'get_new_comments.php');
	req.onreadystatechange = handleResponse;
	req.send(null);
}

function handleResponse()
{
	if(req.readyState == 4 && req.responseText != document.getElementById('kommentare').innerHTML)
	{
		document.getElementById('kommentare').innerHTML = "";
		document.getElementById('kommentare').innerHTML = req.responseText;
	}
}