function opacityplus()
{
    var item = choice();
    var op = getOpacity(item);
    var op = op -(-0.05);
    setOpacity(item, op);



    if(op<1)
    {
		setTimeout("opacityplus();",20);
    }
    else
    {
		setTimeout("opacityminus();",5000);
    }
}



function opacityminus()
{
    var item = choice();
	var op = getOpacity(item);
    var op = op -(0.05);
    setOpacity(item, op);

    if(op>0)
    {
		setTimeout("opacityminus();",20);
    }
    else
    {
		clearTimeout(casovac);
		var dalsi = nextt();
		casovac = setTimeout(function(){header_change(dalsi);},10);
    }
}











function getOpacity(element)
{
	var opacity = null;
	var browser = brow();

	if(browser=="IE")
	{
		filter = element.style.filter;
		if(filter)
		{
			alpha = filter.split("alpha(opacity=");
			opacity = alpha[1].substr(0,(alpha[1].length-1))/100;
		}
	}
	else
	{
		opacity = element.style.opacity;
	}

	return opacity;
}

function setOpacity(element, o)
{
	var browser = brow();
	var item = element;
	if(browser=="IE")
	{
		item.style.filter = "alpha(opacity=" + (o*100) + ")";
	}
	else
	{
		item.style.opacity = o;
	}
}

function brow()
{
	if(navigator.userAgent.indexOf("MSIE")!=-1)
	{browser = "IE";}
	else
	{browser = "Mozilla";}
	return browser;
}
function nextt()
{
	if(document.getElementById('ab').style.display=="block")
	{
		item = 'b';
	}
	if(document.getElementById('bb').style.display=="block")
	{
		item = 'c';
	}
	if(document.getElementById('cb').style.display=="block")
	{
		item = 'd';
	}
	if(document.getElementById('db').style.display=="block")
	{
		item = 'a';
	}
	return item;
}

function choice()
{
	if(document.getElementById('ab').style.display=="block")
	{
		item = document.getElementById('ab');
	}
	if(document.getElementById('bb').style.display=="block")
	{
		item = document.getElementById('bb');
	}
	if(document.getElementById('cb').style.display=="block")
	{
		item = document.getElementById('cb');
	}
	if(document.getElementById('db').style.display=="block")
	{
		item = document.getElementById('db');
	}
	return item;
}



function header_change(item)
{
	//alert('change casovac pred '+casovac+'');
	clearTimeout(casovac);
	casovac = 0;
	//alert('change casovac po '+casovac+'');
	var small = ''+item+'s';
	var big   = ''+item+'b';
	var text  = ''+item+'text'+item+'';
	var sipka = ''+item+'ss';

	document.getElementById('as').style.borderColor = "#0095C7";
	document.getElementById('bs').style.borderColor = "#0095C7";
	document.getElementById('cs').style.borderColor = "#0095C7";
	document.getElementById('ds').style.borderColor = "#0095C7";

	document.getElementById('ab').style.display = "none";
	document.getElementById('bb').style.display = "none";
	document.getElementById('cb').style.display = "none";
	document.getElementById('db').style.display = "none";

	document.getElementById('ass').style.display = "none";
	document.getElementById('bss').style.display = "none";
	document.getElementById('css').style.display = "none";
	document.getElementById('dss').style.display = "none";



	document.getElementById('atexta').style.display = "none";
	document.getElementById('btextb').style.display = "none";
	document.getElementById('ctextc').style.display = "none";
	document.getElementById('dtextd').style.display = "none";

	setCookie('odklik',item,1);
	if(item == 'a')
	{var url = anchorklik[0];}
	if(item == 'b')
	{var url = anchorklik[1];}
	if(item == 'c')
	{var url = anchorklik[2];}
	if(item == 'd')
	{var url = anchorklik[3];}

	document.getElementById('obrazokanchor').href = url;
	document.getElementById('popisanchor').href = url;
	document.getElementById(small).style.borderColor = "#afdef8";
    document.getElementById(sipka).style.display = "block";
	document.getElementById(big).style.display = "block";
	document.getElementById(text).style.display = "block";
    setOpacity(document.getElementById(big), 1);
    casovac = setTimeout("opacityminus();",5000);

}