function switch_eo(eo_div) {
var div_anzahl = 31
	for (var i=1; i<=div_anzahl; i++) {
		var div_walk = 'eo'+i;
		if (div_walk == eo_div) {
			//document.getElementById(div_walk).style.display='block';
			new Effect.Appear(document.getElementById(div_walk), {duration : 0.5 });
		}
			else {
				document.getElementById(div_walk).style.display='none';
			}
	}
}