// Layer ein- und ausblenden

function hide(objname) {
	document.getElementById(objname).style.display="none";
}

function show(objname) {
	document.getElementById(objname).style.display="block";
}

function toggle(objname) {
	var parts=document.getElementById(objname).id.split("_");

	if (parts[1]=="off") {
		show(objname);
		hide(parts[0]+"_on");
	}
	else if (parts[1]=="on") {
		show(objname);
		hide(parts[0]+"_off");
	}
}