var opera = new Boolean()
var nn6 = new Boolean()
var nn4 = new Boolean()
var ie4 = new Boolean()

opera = false
nn6 = false
nn4 = false
ie4 = false

ie4 = (document.all && navigator.userAgent.indexOf("MSIE") != -1) ? true : false;
opera = (navigator.userAgent.indexOf("Opera") != -1) ? true : false;

nn4 = (document.layers && navigator.userAgent.indexOf("Mozilla") != -1 && navigator.appVersion.substring(0,1) == 4) ? true : false;
nn6 = (navigator.userAgent.indexOf("Netscape") != -1 && navigator.appVersion.substring(0,1) >= 5) ? true : false;

if (!nn6)
nn6 = (navigator.userAgent.indexOf("Gecko") && navigator.appVersion.substring(0,1) >= 5) ? true : false; 

function showLayer(name)
{
	if (ie4 || opera)
		document.all[name].style.visibility = 'visible'

	if (nn4)
		document.layers[name].visibility = 'visible'

	if (nn6) 
		document.getElementById(name).style.visibility = 'visible' 	
}

function hideLayer(name)
{
	if (ie4 || opera)
		document.all[name].style.visibility = 'hidden'
	if (nn4)
		document.layers[name].visibility = 'hidden'
	if (nn6) 
		document.getElementById(name).style.visibility = 'hidden' 	
}

function moveLayerY(name,y)
{
	if (ie4 || opera)
		document.all[name].style.top = y

	if (nn4)
		document.layers[name].top = y

	if (nn6) 
		document.getElementById(name).style.top = y+'px'
}

function changeImageOnLayer(lname, iname, src)
{
	if (nn4)
		document.layers[lname].document[iname].src = src
	else
		document[iname].src = src
}

//
//	wstawianie tekstu na warstwe
//

function layerText(name, text)
{

	if (ie4 || opera)
		document.all[name].innerHTML = text

	if (nn6) 
		document.getElementById(name).innerHTML = text
}

function moveLayerX(name,x)
{
	if (ie4 || opera)
		document.all[name].style.left = x

	if (nn4)
		document.layers[name].left = x

	if (nn6) 
		document.getElementById(name).style.left = x+'px'
}

function getLayerX(name)
{
	if (ie4 || opera)
		return document.all[name].offsetLeft

	if (nn4)
		return document.layers[name].offsetLeft

	if (nn6) 
		return document.getElementById(name).offsetLeft
}