// Ebenenkontrolle ----------------------------------------------------------------------
// Styleswitch und LayerRef ermoeglichen cross-browser objekt-referenz
// Funktionsaufruf fuer NS 4-Reload-Bug
	function initBrowser(){
		if (document.layers) { //NS 4.x
			layerStyleRef="layer.";
			layerRef="document.layers";
			styleSwitch="";
			ns6="";
		}
		else if (document.getElementById) { //NS 6, IE 5.x
			layerStyleRef="layer.";
			layerRef="document.getElementById(";
			styleSwitch=").style";
			ns6=")";
		}
		else {  //IE 4.x
			layerStyleRef="layer.style.";
			layerRef="document.all";
			styleSwitch=".style";
			ns6="";
		}
	}
// --------------------------------------------------------------------------------------
// Layer zeigen - verbergen
	function showLayer(layerName) {
		initBrowser();  
		eval(layerRef + '["'+layerName+'"]' + styleSwitch + '.visibility="visible"');
	}
	function hideLayer(layerName) {
		initBrowser();
	    eval(layerRef + '["'+layerName+'"]' + styleSwitch +'.visibility="hidden"');
	}
// Image anzeigen -verbergen
	function showImage(imagename,text){
		showLayer('image');
		bild  = new Image();
		bild.src = imagename;
		window.document.images['theimage'].src = bild.src;
		var imageText = text;
		if(text){
			imageText = text;
		}else	{
			imageText = "";
		}
		window.document.getElementById("imageText").innerHTML=imageText;
	}
	function hideImage(){
		hideLayer('image');
		bild  = new Image();
		bild.src = 'blank.gif';
		window.document.images['theimage'].src = bild.src
		window.document.getElementById("imageText").innerHTML="";
	}
// --------------------------------------------------------------------------------------
// prüfen ob ein Punkt mit ja beantwortet wurde
function checkForm(form){
	/*for (i=0;i<document.forms[0].radios.length;i++)
	{
		if (document.forms[0].radios[i].checked)
		{
			user_input = document.forms[0].radios[i].value;
		}
	}*/
	var counter=0;
	for (i=0;i<form.elements.length;i++)
	{
		if (form.elements[i].type == "radio" && form.elements[i].checked == true)
		{
			var user_input = form.elements[i].value;
			if (user_input=='1'){
				counter++;
			}
		}
	}
	form.punkte.value = counter 
	return true;
}

function validateForm(form){
	var flag=true;
	if (form.typ[0].checked == true && form.telefon.value == "") {
		alert("Bitte geben Sie eine Telefonnummer ein.");
		return false;
	}
	if (form.typ[1].checked == true && form.email.value == "@"){
		alert("Bitte geben Sie eine E-Mail-Adresse ein.");
		return false;
	}
	else {
		return true;
	}
	
	/*if (counter > 0){
		return true;
	}else{
		form.action = topic+"_antwort_negativ.html";
		
		return true;
	}*/
	return false;
}
function changeClass(element, newClass) { 
	//element.className=newClass;
}