function ShowLayer(wert) {
	if (document.layers) {
		obj = eval("document."+wert);
	} 
	else {
		obj = document.getElementById(wert);
		obj = obj.style;
	} 
		obj.visibility = "visible";
}

function UnshowLayer(wert) {
	if (document.layers) {
		obj = eval("document."+wert);
	} 
    else {
		obj = document.getElementById(wert);
		obj = obj.style;
	}
		obj.visibility = "hidden";
}