function getElementsByClassName(oElm, strTagName, strClassName){
	/*
		Written by Jonathan Snook, http://www.snook.ca/jonathan
		Add-ons by Robert Nyman, http://www.robertnyman.com
	*/
	var arrElements = (strTagName == "*" && oElm.all)? oElm.all : oElm.getElementsByTagName(strTagName);
	var arrReturnElements = new Array();
	strClassName = strClassName.replace(/\-/g, "\\-");
	var oRegExp = new RegExp("(^|\\s)" + strClassName + "(\\s|$)");
	var oElement;
	for(var i=0; i<arrElements.length; i++){
		oElement = arrElements[i];
		if(oRegExp.test(oElement.className)){
			arrReturnElements.push(oElement);
		}
	}
	return (arrReturnElements)
}
function navhide(navi,menue,classe1,classe2) {
	if (classe1) {
		var hide_element = getElementsByClassName(document.getElementById(navi), "*",  classe1);
		for (var i=0; i<hide_element.length; i++) {
			hide_element[i].className = "non_"+classe1;
		}
	}
	if (classe2) {
		var hide_element = getElementsByClassName(document.getElementById(navi), "*",  classe2);
		for (var i=0; i<hide_element.length; i++) {
			hide_element[i].className = "non_"+classe2;
		}
	}
	if (menue) {
		var hide_element = getElementsByClassName(document.getElementById(navi), "*",  menue);
		for (var i=0; i<hide_element.length; i++) {
			hide_element[i].className = hide_element[i].className.replace(menue,menue+"_white");
		}	
	}
	if (navi=="nav1") {
		if (document.getElementById("navbalken11_active")) {
			document.getElementById("navbalken11_active").style.visibility = "hidden";
		}
		if (document.getElementById("navbalken12_active")) {
			document.getElementById("navbalken12_active").style.visibility = "hidden";
		}
	}
}

function navshow(navi,menue,classe1,classe2) {
	var hide_element = getElementsByClassName(document.getElementById(navi), "*", "non_"+classe1);
	for (var i=0; i<hide_element.length; i++) {
		hide_element[i].className = classe1;
	}
	if (classe2) {
		var hide_element = getElementsByClassName(document.getElementById(navi), "*", "non_"+classe2);
		for (var i=0; i<hide_element.length; i++) {
			hide_element[i].className = classe2;
		}
	}
	if (menue) {
		var hide_element = getElementsByClassName(document.getElementById(navi), "*",  menue+"_white");
		for (var i=0; i<hide_element.length; i++) {
			hide_element[i].className = hide_element[i].className.replace(menue+"_white", menue);
		}	
	}
	if (navi=="nav1") {
		if (document.getElementById("navbalken11_active")) {
			document.getElementById("navbalken11_active").style.visibility = "visible";
		}
		if (document.getElementById("navbalken12_active")) {
			document.getElementById("navbalken12_active").style.visibility = "visible";
		}
	}
}