function closeMessage(){

	if (window.XMLHttpRequest) {
		req = new XMLHttpRequest();
	}
	else if (window.ActiveXObject) {
		req = new ActiveXObject("Microsoft.XMLHTTP");
	}
	else {
		return false;
	}

	req.open("GET", "./clear_messages.idx", true);
	
	req.send(null);
	
	document.getElementById('top_message_box').style.display = "none";
	
}