function getObject( sId ) {
		var objref;
		if (document.getElementById) {
			objref  = document.getElementById(sId);
		} else if (document.all) {
			objref = document.all[sId];
		} else if (document.layers) {
			objref = document.layers[sId];
		} else {
			return false;
		}
		return objref;
	}

	function showGreeting() {
		var block_greeting = getObject('mn_greeting');
		block_greeting.style.display='block';
	}
	function hideGreeting() {
		var block_greeting = getObject('mn_greeting');
		block_greeting.style.display='none';
	}