function createXMLHTTPRequest()
{
	if(window.XMLHttpRequest)
	{
		return new XMLHttpRequest();
	}
	else if(window.ActiveXObject)
	{
		try
		{
			return new ActiveXObject("Msxml2.XMLHTTP");
		}
		catch(e)
		{
			try
			{
				return new ActiveXObject("Microsoft.XMLHTTP");
			}
			catch(e)
			{
				return null;
			}
		}
	}
}

var http_request = null;

function doRequest(url) {
	
	http_request = createXMLHTTPRequest();
	http_request.onreadystatechange = alertInhalt;
	http_request.open('GET', '/Includes/gettime.php', true);
	http_request.send(null);

}

function alertInhalt() {

	if (http_request.readyState == 4) {
		 
		if(document.getElementById("clock").innerHTML != http_request.responseText) {	
			
			document.getElementById("clock").innerHTML = http_request.responseText;
		}
	}

}