var fadeEffect = null;
var appearEffect = null;
Event.observe(document.body, 'mouseover', function(e) {
	var elem = e.findElement('#wetter');
	if (elem) {
		try {fadeEffect.cancel();} catch(e) {}
		appearEffect = new Effect.Appear('wetter-box');
	}
});

Event.observe(document.body, 'mouseout', function(e) {
	var elem = e.findElement('#wetter');
	if (elem ) {
		try {appearEffect.cancel(); } catch(e) {}
		fadeEffect = new Effect.Fade('wetter-box');
	}
});