function requestArbeitshoehen(typ_id) {
	var xhReq = createXMLHttpRequest();					
	var timer = setTimeout(function(){ sss('ajax_loader').style.visibility='visible'; }, 200);
	
	xhReq.open("get", "inc_hoehen.php?typ_id="+typ_id, true);
	
	xhReq.onreadystatechange = function() {
		if (xhReq.readyState != 4)  { return; }
		clearTimeout(timer);
		sss('ajax_loader').style.visibility='hidden';

sss('ajax_nicht_zugewiesen').style.visibility='hidden';
sss('ajax_nicht_zugewiesen').innerHTML = xhReq.responseText;
sss('ajax_nicht_zugewiesen').style.visibility='visible';

	}
 xhReq.send(null);
}