var referringURL = document.referrer;
var thisDomain = document.domain;
if ((referringURL.length == 0) || (referringURL.indexOf(thisDomain) == -1)) {
	// Display message box
	document.getElementById("urlreferralmsgbox").style.display = "";
} else {
	// Hide message box
	document.getElementById("urlreferralmsgbox").style.display = "none";
}