function clearMessage(msgid) {
	var creq = initrequest(true);
	if (!creq) {
		return;
	}
	creq.open('POST','/clearmessage.act',true);
	creq.onreadystatechange = function() {
		if (creq.readyState != 4) {
			return;
		}
		if (creq.status == 200) {
			hideobj('msg-'+msgid);
		} else {
			unhideobj('msg-'+msgid);
			alertMessage(creq.responseText);
		}
	};
	creq.setRequestHeader('Content-Type','application/x-www-form-urlencoded');
	creq.send('MESSAGEID='+msgid);
}