function roletka()
	{
	var display = document.getElementById('roletka').style.display;

		if(display=="none")
		{
			document.getElementById('roletka').style.display = '';
		}
		else
		{
			document.getElementById('roletka').style.display = 'none';
		}
	}

	function Ukaz(obj)
	{
		// Pro NN 4+
		if (document.layers) {document.layers[obj].visibility = "show";}

		// Pro IE 4
		if (document.all && !document.getElementById) document.all[obj].style.visibility = "visible";

		// Pro NN 6+, IE 5+, Mozillu 1.2+, Operu 7+
		if (document.getElementById) document.getElementById(obj).style.visibility = "visible";
	}
	function Schovej(obj)
	{
		if (document.layers) {document.layers[obj].visibility = "hide";}

		if (document.all && !document.getElementById) document.all[obj].style.visibility = "hidden";

		if (document.getElementById) document.getElementById(obj).style.visibility = "hidden";
	}

	function Fade(id)
	{
	var i;

	if(navigator.appName == "Microsoft Internet Explorer")
	{
		for(i=1;i<10;i++)
		setTimeout('document.getElementById("' + id + '").style.filter = "alpha(opacity=' + (100-i*10) + ')"', 50*i);
	}
	else
	{
		for(i=1;i<10;i++)
		setTimeout('document.getElementById("' + id + '").style.opacity="' + (1-i*0.1) + '"', 50*i);
	}

	setTimeout('document.getElementById("' + id + '").style.visibility="hidden"', 500);
	}

	function Appear(id)
	{
	var i;

	setTimeout('document.getElementById("' + id + '").style.visibility=""', 500);

	if(navigator.appName == "Microsoft Internet Explorer")
	{
		for(i=1;i<10;i++)
		setTimeout('document.getElementById("' + id + '").style.filter = "alpha(opacity=' + (i*10) + ')"', eval(550)+50*i);
	}
	else
	{
		for(i=1;i<10;i++)
		setTimeout('document.getElementById("' + id + '").style.opacity="' + (i*0.1) + '"', eval(550)+50*i);
	}
	}

	function sipka(id)
	{
		var pozadi = "#f1f1f1  url(images/olddesing/sipka.gif) no-repeat right center";

		if(id == 1)
		{
			document.getElementById('prvni').style.background = pozadi;
			document.getElementById('druhy').style.background = "";
			document.getElementById('treti').style.background = "";

			var adresa = "images/olddesing/obal_cdrom_produkty.png";
		}
		if(id == 2)
		{
			document.getElementById('prvni').style.background = "";
			document.getElementById('druhy').style.background = pozadi;
			document.getElementById('treti').style.background = "";

			var adresa = "images/olddesing/obal_aktualizace_produkty.png";
		}
		if(id == 3)
		{
			document.getElementById('prvni').style.background = "";
			document.getElementById('druhy').style.background = "";
			document.getElementById('treti').style.background = pozadi;

			var adresa = "images/olddesing/obal_dvd1_produkty.png";
		}
		if(id == 4)
		{
			document.getElementById('prvni').style.background = "";
			document.getElementById('druhy').style.background = "";
			document.getElementById('treti').style.background = "";

			var adresa = "images/olddesing/obal_dvd2_produkty.png";
		}


		Fade('obal');
		setTimeout("document.getElementById('obal').src='" + adresa + "'", 500);
		Appear('obal');
        }