function handler(event){
	opt = event.target;
	if (opt.hasClass("disabled")){
		opt.selected=false;
		return;
	}
	if (opt.selected){
		var sel = 0;
		opt.getParent().getChildren().each(function(item, index){
			if (item.selected)
				sel++;
		});
	 	if (sel>max){
	 		opt.selected=false;
// 	 		alert("Maximal "+max+" Einträge erlaubt");
	 	}
	 }
}
window.addEvent('domready', function() {
	$('bereich').addEvent('click', handler);
	$('zielgruppe').addEvent('click', handler);
});