function checkDS() {
	result=document.form1.ds.checked;
	if (!result) {
		alert('Sie müssen der Datenschutz-Erklärung zustimmen!');
	} 
	return result;	
}

function lhideall()
{
	for (var i=1; i<15; i++) {
		l=document.getElementById('layer'+String(i));
		if (l!=null) {
			l.style.visibility='hidden';
		} else break;
	}
}

function lhide(s)
{
	l=document.getElementById(s);
	if (l!=null) {
		l.style.visibility='hidden';
	}
}

function lshow(s)
{
	var temp=document.getElementById(s);
	lhideall();	
	temp.style.visibility='visible';
}