YAHOO.util.Event.onDOMReady(function() {
	var util = YAHOO.util;
	var nMessages = 5;
	var messageIndex = 1;
	var getMsg = function(index) { return util.Dom.get('didyouknow'+index); };
	var alternate;
	
	if (YAHOO.env.ua.ie == 0 || YAHOO.env.ua.ie > 6) {
	   alternate = function() {
			var oldM = getMsg(messageIndex);
			messageIndex = (messageIndex==nMessages) ? 1 : messageIndex+1;
			var newM = getMsg(messageIndex);
			
			var msgAnim = new util.Anim(oldM, { opacity: { to: 0, by: 0.1 }});
			msgAnim.onComplete.subscribe(function() {
				oldM.style.display = 'none';
				newM.style.display = '';
				(new util.Anim(newM, { opacity: { to: 1, by: 0.1 }})).animate();
			}); 
			msgAnim.animate();
			
	   };
	// no anim for IE < 7
	} else {
	   alternate = function() {
			var oldM = getMsg(messageIndex);
			messageIndex = (messageIndex==nMessages) ? 1 : messageIndex+1;
			var newM = getMsg(messageIndex);
			
			oldM.style.display = 'none';
			newM.style.display = '';
	   };
	}
	
	setInterval(alternate,5000);
	
});