function getFact(){
	try{ xmlhttp = window.XMLHttpRequest ? new XMLHttpRequest() : new ActiveXObject("Microsoft.XMLHTTP"); }
	catch (e){ /* do nothing */ }
	xmlhttp.onreadystatechange = showFact;
	uniqueString = GetUniqueString();
	getURL = '/facts.php?us='+uniqueString;
	xmlhttp.open("GET", getURL);
	xmlhttp.send(null);
}

function showFact(){
	if ((xmlhttp.readyState == 4) && (xmlhttp.status == 200)){
		document.getElementById("didYouKnow").innerHTML = xmlhttp.responseText;
		setTimeout("getFact()",15000)
	}
}

function GetUniqueString(){
	var theDate = new Date();
	return Date.UTC(theDate.getYear(),theDate.getMonth(),theDate.getDate(),theDate.getHours(),theDate.getMinutes(),theDate.getSeconds(), theDate.getMilliseconds());
}

getFact();