userAgent = navigator.userAgent.toLowerCase();
var n4 = document.layers;
var ieWin = (document.all && userAgent.indexOf("mac")<0);
var ieMac = (document.all && !ieWin && userAgent.indexof("icab")<0);
var w3c = document.documentElement;
var aol = (userAgent.indexOf("aol")>-1);


var flimmernover = new Image;
flimmernover.src = "img/layout/tv/tv-mitte.jpg";
var aboutover = new Image;
aboutover.src = "img/layout/tv/tv-about.jpg";
var indexover = new Image;
indexover.src = "img/layout/tv/tv-index.jpg";
var mailingover = new Image;
mailingover.src = "img/layout/tv/tv-mailing.jpg";
var previewover = new Image;
previewover.src = "img/layout/tv/tv-preview.jpg";
var wirover = new Image;
wirover.src = "img/layout/tv/tv-wir.jpg";
var kontaktover = new Image;
kontaktover.src = "img/layout/tv/tv-kontakt.jpg";
var loginover = new Image;
loginover.src = "img/layout/tv/tv-login.jpg";




function tvwechsel(tvname) 
{
	document.images.tv.src = eval(tvname + "over.src");
}

function blenden()
{
	einblenden('body');
}
function einblenden(id)
{
	     if (n4)    { document.layers[id].visibility = "visible";}
	else if (ieWin || ieMac) { document.all[id].style.visibility = "visible";}
	else if (w3c)   { document.getElementById(id).style.visibility = "visible";}
	else { document.all[id].style.visibility = "visible";}
}