//browsererkennung
var isMinNS4 = (navigator.appName.indexOf("Netscape") >= 0 && parseFloat(navigator.appVersion) >= 4&&parseFloat(navigator.appVersion) < 5) ? 1 : 0;
var isMinNS6 = (isMinNS4 && navigator.userAgent.indexOf("Gecko")>=0) ? 1 : 0;
var isMinIE4 = (document.all) ? 1 : 0;
var isMinIE5 = (isMinIE4 && navigator.appVersion.indexOf("5.")) >= 0 ? 1 : 0;
var isDOM = (document.getElementById) ? 1 : 0;

//macht entsprechende container sicht- oder unsichtbar
function zeigeEbene (id){
  if (isMinIE4) document.all[id].style.visibility = "visible" ; 
  if (isMinIE4||isDOM) document.getElementById(id).style.visibility = "visible";
  if (isMinNS4) document.layers[id].visibility = "show";
}

function verbergeEbene (id){
  if (isMinIE4) document.all[id].style.visibility = "hidden";  
  if (isMinIE4||isDOM) document.getElementById(id).style.visibility = "hidden";
  if (isMinNS4) document.layers[id].visibility = "hide";
}


// preloading navigation-images
if (document.images) { 
img1on=new Image();
img1on.src="images/nav/home_high.gif";
img2on=new Image();
img2on.src="images/nav/unsere-gruppe_high.gif";
img3on=new Image();
img3on.src="images/nav/aktivitaeten_high.gif";
img4on=new Image();
img4on.src="images/nav/regionales_high.gif";
img5on=new Image();
img5on.src="images/nav/termine_high.gif";
img6on=new Image();
img6on.src="images/nav/links_high.gif";
img7on=new Image();
img7on.src="images/nav/kontakt_high.gif";

img1off=new Image();
img1off.src="images/nav/home_low.gif";
img2off=new Image();
img2off.src="images/nav/unsere-gruppe_low.gif";
img3off=new Image();
img3off.src="images/nav/aktivitaeten_low.gif";
img4off=new Image();
img4off.src="images/nav/regionales_low.gif";
img5off=new Image();
img5off.src="images/nav/termine_low.gif";
img6off=new Image();
img6off.src="images/nav/links_low.gif";
img7off=new Image();
img7off.src="images/nav/kontakt_low.gif";
}

// function to activate images
function imgOn(imgName) {
	if (isDOM) {
	//alert('dom');
	document.getElementById(imgName).src = eval(imgName+"on.src");
	} else {
	//alert('nodom');
	document[imgName].src=eval(imgName+"on.src");
	}
}

// function to deactivate images
function imgOff(imgName) {
	if (isDOM) {
	document.getElementById(imgName).src = eval(imgName+"off.src");
	} else {
	document[imgName].src=eval(imgName+"off.src");
	}
}

//old versions
// function to activate images
function imgOnXXX(imgName) {
	if (document.images) {
	document[imgName].src=eval(imgName+"on.src");
	}
}

// function to deactivate images
function imgOffXXX(imgName) {
	if (document.images) {
	document[imgName].src=eval(imgName+"off.src");
	}
}

/*XXXX FROM HERE OLD STUFF XXXX*/

//markiert das hauptmenu
var frozennav = 1;
function navigation(nr) {
	for (i = 1; i <= 5; i++) {
		if (i == nr) {
			zeigeEbene('hauptnav'+nr+'00');
		}
		if (i != nr) {
			verbergeEbene('hauptnav'+i+'00');
		}
		frozennav = nr;
	}
}

//markiert das hauptmenu erneut nach mouseover und mouseout
function freezethenav(nr) {
	for (i = 1; i <= 5; i++) {
		if (i == nr) {
			zeigeEbene('hauptnav'+nr+'00');
		}
		if (i != nr) {
			verbergeEbene('hauptnav'+i+'00');
		}
	}
	if (frozennav != 0) {
	zeigeEbene('hauptnav'+frozennav+'00');
	}
}