function show_submenu(submenu,start){
	if (document.getElementById(submenu).style.visibility == "visible"){
		document.getElementById(submenu).style.visibility = "hidden";
		document.getElementById(start).style.visibility = "visible";
	}else{
		document.getElementById(submenu).style.visibility = "visible";
		document.getElementById(start).style.visibility = "hidden";
	}
}
function submenu_over(menu){
	document.getElementById(menu).style.color = "#cccccc";
}
function submenu_out(menu){
	document.getElementById(menu).style.color = "#000000";
}
function show_contact(){
	if (document.getElementById("content_contact1").style.visibility == "visible" || document.getElementById("content_contact2").style.visibility == "visible"){
		document.getElementById("content_contact1").style.visibility = "hidden";
		document.getElementById("content_contact2").style.visibility = "hidden";
		document.getElementById("content_contact3").style.visibility = "hidden";
	}else{
		document.getElementById("content_contact1").style.visibility = "visible";
		document.getElementById("content_contact2").style.visibility = "hidden";
	}
}

function hide_contact(){
	document.getElementById("content_contact1").style.visibility = "hidden";
	document.getElementById("content_contact2").style.visibility = "hidden";
	document.getElementById("content_contact3").style.visibility = "hidden";
}
function show_contact_next(){
	document.getElementById("content_contact1").style.visibility = "hidden";
	document.getElementById("content_contact2").style.visibility = "visible";
}
function show_coming_soon(){
	document.getElementById("coming_soon").style.visibility = "visible";
}
function hide_coming_soon(){
	document.getElementById("coming_soon").style.visibility = "hidden";
}
function show_danke(){
	document.getElementById("content_contact3").style.visibility = "visible";
}
function menu_over(menu){
	document.getElementById(menu).style.backgroundColor = "#cccccc";
	document.getElementById(menu).style.color = "#666666";
}
function menu_out(menu){
	document.getElementById(menu).style.backgroundColor = "#666666";
	document.getElementById(menu).style.color = "#ffffff";
}
function check_form(){
	if(document.getElementById("email").value.indexOf("@")==-1 || document.getElementById("email").value.indexOf(".")==-1){ 
		if (document.getElementById("email").value.indexOf("@")==-1){
			alert("Bitte das E-Mail-Feld korrekt ausfüllen");
			return;
		}
		if (document.getElementById("email").value.indexOf(".")==-1){
			alert("Bitte das E-Mail-Feld korrekt ausfüllen");
			return;
		}
	}else{ 
		document.getElementById("register_form").submit();
	}
}

function show_blatt(blattnr, maxblatt){
	document.getElementById("blatt"+blattnr).style.visibility = "visible";
	for (var i = 1; i <= maxblatt; i++){
		if (i != blattnr){
			document.getElementById("blatt"+i).style.visibility = "hidden";
		}
	}
}
function anmeldung_open(){
    document.getElementById('newsletter_seite_form').style.visibility = "visible";
}
function anmeldung_close(){
    document.getElementById('newsletter_seite_form').style.visibility = "hidden";
}

function check_form_nl(){
	if(((document.formular_nl.sex[0].checked == false)&&(document.formular_nl.sex[1].checked == false)) || document.getElementById("firstname").value=="" || document.getElementById("lastname").value=="" || document.getElementById("email_address").value.indexOf("@")==-1 || document.getElementById("email_address").value.indexOf(".")==-1){ 
		if ((document.formular_nl.sex[0].checked == false)&&(document.formular_nl.sex[1].checked == false)){
			alert("Bitte die Anrede auswählen");
			return;
		}
		if (document.getElementById("firstname").value==""){
			alert("Bitte das Vorname-Feld korrekt ausfüllen");
			return;
		}
		if (document.getElementById("lastname").value==""){
			alert("Bitte das Nachname-Feld korrekt ausfüllen");
			return;
		}
		if (document.getElementById("email_address").value.indexOf("@")==-1){
			alert("Bitte das E-Mail-Feld korrekt ausfüllen");
			return;
		}
		if (document.getElementById("email_address").value.indexOf(".")==-1){
			alert("Bitte das E-Mail-Feld korrekt ausfüllen");
			return;
		}
	}else{ 
		document.getElementById("formular_nl").submit();
	}
}