function init_messages() {
	var timer = 5;
	var tgt = $('globalMessages');
	if (tgt.innerHTML != '') {
		for (var i = 0 ; i <= 100 ; i++) {
			Element.setOpacity.delay(timer+(i/100), tgt, (100-i)/100);
		}
	}
}

Event.observe(window, 'load', init_messages);