function travelSetPeriod(status) {
	var objUndef = document.getElementById('travelPeriodUndefined');
	var objDef = document.getElementById('travelPeriodDefined');
	
	if (status == true) {
		objUndef.className = objUndef.className.replace(/ active/, " inactive");
		objDef.className = objDef.className.replace(/ inactive/, " active");
		
		document.travelform.feld_von_visible.disabled = false;
		document.travelform.feld_von.disabled = false;
		document.travelform.feld_bis_visible.disabled = false;
		
		document.travelform.feld_von_epoche.disabled = false;
		document.travelform.feld_bis_epoche.disabled = false;
		
		document.travelform.feld_bis.disabled = false;
		document.travelform.inzeit.disabled = false;
		document.travelform.intage.disabled = false;
		
	} else {
		objUndef.className = objUndef.className.replace(/ inactive/, " active");
		objDef.className = objDef.className.replace(/ active/, " inactive");
		
		document.travelform.feld_von_visible.disabled = true;
		document.travelform.feld_von.disabled = true;
		document.travelform.feld_bis_visible.disabled = true;
		
		document.travelform.feld_von_epoche.disabled = true;
		document.travelform.feld_bis_epoche.disabled = true;
		
		document.travelform.feld_bis.disabled = true;
		document.travelform.inzeit.disabled = true;
		document.travelform.intage.disabled = true;
	}
}
function travelSetPeriodIntage(status) {
	if (status == true) {
		document.travelform.intage.disabled = false;
		document.travelform.inzeit[1].checked = true;
		document.travelform.intage.focus();
	} else {
		document.travelform.intage.disabled = true;
	}
}