function poczatekladowania() {

var rv = -1; // Return value assumes failure.
if (navigator.appName == 'Microsoft Internet Explorer')
{
	var ua = navigator.userAgent;
	var re  = new RegExp("MSIE ([0-9]{1,}[\.0-9]{0,})");
	if (re.exec(ua) != null)
		 rv = parseFloat( RegExp.$1 );
}

var browserName=navigator.appName;
 
if (browserName=="Microsoft Internet Explorer") 
{
var ov = document.getElementById('ov');

	if (rv<=6)
	{
	var sele = document.getElementsByTagName("select");
	for (var i=0; i<sele.length; i++) sele[i].style.visibility = "hidden";
  
 	document.getElementById('ov').style.display="block";
	document.getElementById('h24_overlay').style.display="block";	
	}
	else if (rv<8)
	{
	document.getElementById('ov').style.display="block";
	document.getElementById('h24_overlay').style.display="block";
	}
	else
	{
	if (ov) ov.style.display="block";
	document.getElementById('h24_overlay').style.display="table";
	}
}
else
{
document.getElementById('h24_overlay').style.display="table";
}
document.body.style.overflow = "hidden";
document.getElementById('h24_obudowa').style.overflow = "hidden";
//document.getElementsByTagName("html")[0].style.overflow = "hidden";
}

function koniecladowania() {
var ov = document.getElementById('ov');
document.getElementById('h24_overlay').style.display="none";
if (navigator.appName=="Microsoft Internet Explorer") { if (ov) ov.style.display="none"; } else {}
document.body.style.overflow = "auto";
//document.getElementsByTagName("html")[0].style.overflow = "auto";
}