var getElementsByClassName = function (className, tag, elm){
	if (document.getElementsByClassName) {
		getElementsByClassName = function (className, tag, elm) {
			elm = elm || document;
			var elements = elm.getElementsByClassName(className),
				nodeName = (tag)? new RegExp("\\b" + tag + "\\b", "i") : null,
				returnElements = [],
				current;
			for(var i=0, il=elements.length; i<il; i+=1){
				current = elements[i];
				if(!nodeName || nodeName.test(current.nodeName)) {
					returnElements.push(current);
				}
			}
			return returnElements;
		};
	}
	else if (document.evaluate) {
		getElementsByClassName = function (className, tag, elm) {
			tag = tag || "*";
			elm = elm || document;
			var classes = className.split(" "),
				classesToCheck = "",
				xhtmlNamespace = "http://www.w3.org/1999/xhtml",
				namespaceResolver = (document.documentElement.namespaceURI === xhtmlNamespace)? xhtmlNamespace : null,
				returnElements = [],
				elements,
				node;
			for(var j=0, jl=classes.length; j<jl; j+=1){
				classesToCheck += "[contains(concat(' ', @class, ' '), ' " + classes[j] + " ')]";
			}
			try	{
				elements = document.evaluate(".//" + tag + classesToCheck, elm, namespaceResolver, 0, null);
			}
			catch (e) {
				elements = document.evaluate(".//" + tag + classesToCheck, elm, null, 0, null);
			}
			while ((node = elements.iterateNext())) {
				returnElements.push(node);
			}
			return returnElements;
		};
	}
	else {
		getElementsByClassName = function (className, tag, elm) {
			tag = tag || "*";
			elm = elm || document;
			var classes = className.split(" "),
				classesToCheck = [],
				elements = (tag === "*" && elm.all)? elm.all : elm.getElementsByTagName(tag),
				current,
				returnElements = [],
				match;
			for(var k=0, kl=classes.length; k<kl; k+=1){
				classesToCheck.push(new RegExp("(^|\\s)" + classes[k] + "(\\s|$)"));
			}
			for(var l=0, ll=elements.length; l<ll; l+=1){
				current = elements[l];
				match = false;
				for(var m=0, ml=classesToCheck.length; m<ml; m+=1){
					match = classesToCheck[m].test(current.className);
					if (!match) {
						break;
					}
				}
				if (match) {
					returnElements.push(current);
				}
			}
			return returnElements;
		};
	}
	return getElementsByClassName(className, tag, elm);
};

function wizShowPage(wizPageId) { 
	var wizPages = getElementsByClassName("wizPage", "fieldset", document.getElementById("feedbackform"));
	var wizHeaders = getElementsByClassName("wizHeader", "span", document.getElementById("feedbackform"));	

    if (wizPages[wizPageId].className == "wizPage wizPageCollapsed")
    {
			wizHeaders[wizPageId].className = "wizHeader wizHeaderExpanded";
			wizPages[wizPageId].className = "wizPage wizPageExpanded";   
    }
    else
    {
			wizHeaders[wizPageId].className = "wizHeader wizHeaderCollapsed";
			wizPages[wizPageId].className = "wizPage wizPageCollapsed";       
    }
}

function getElementsByClassNameLF(tagName, aClass) {
	var z = [];
	if (!document.getElementsByTagName) return z;

	var x = document.getElementsByTagName(tagName);

	for (var i=0; i < x.length; i++) {
		if (x[i].className == aClass) z.push(x[i]);
	} 

	return z;
}

function initFeedback() {

	var wizHeaders = getElementsByClassName("wizHeader", "span", document.getElementById("feedbackform"));
	if(!wizHeaders) return;

	var wizPages = getElementsByClassName("wizPage", "fieldset", document.getElementById("feedbackform"));
	if(!wizPages) return;

    // Header als link toevoegen
    var headerText = '';
	var a = document.createElement("a");

    a.onclick = new Function("wizShowPage(0);");		    
    a.setAttribute("href", "#");		

    if (document.all) {
	    headerText = wizHeaders[0].innerText;
	    wizHeaders[0].innerText = "";
    }
    else {
        headerText = wizHeaders[0].textContent;
        wizHeaders[0].textContent = "";
    }
    
	var textNode = document.createTextNode(headerText);
    a.appendChild(textNode);

	wizHeaders[0].appendChild(a);
	
	wizShowPage(0);
}

function addLoadEvent(func) {
	var oldonload = window.onload;
	if (typeof window.onload != 'function') {
		window.onload = func;
	} else {
		window.onload = function() {
			if (oldonload) {
				oldonload();
			}
			func();
		}
	}
}

addLoadEvent(function() {initFeedback();});