function createRequest()
{
	try {
		return request = new XMLHttpRequest();
	} catch (trymicrosoft) {
		try {
			return request = new ActiveXObject("Msxml2.XMLHTTP");
		} catch (othermicrosoft) {
			try {
				return request = new ActiveXObject("Microsoft.XMLHTTP");
			} catch (failed) {
				return request = false;
			}
		}
	}

	if (!request) { alert("Error initializing XMLHttpRequest!"); }
}

function checkvisitinfo(base_url)
{
	//1000*60*30;

	setInterval("updateinfo('"+base_url+"')",60000);
}
function updateinfo(base_url)
{

	var request = createRequest();
	var url = base_url+"update_visits.php";
	//alert(url);
	request.open("GET", url, true);
	request.onreadystatechange = function()
	{

		if (request.readyState == 4)
		{			
			if (request.status == 200)
			{				
				//alert("update");
														
			} else {
				//alert("status is " + request.status);
			}			
		}
	}
	request.send(null);
}