var isMinNS4 = document.layers
var ie=document.all&&navigator.userAgent.indexOf("Opera")==-1
var dom=document.getElementById&&!ie&&navigator.userAgent.indexOf("Opera")==-1

var layerWidth = 780;
var layerHeigth = 70;

function hide(layer) 
{
	if (isMinNS4)
		layer.visibility = "hide";
	if (ie||dom)
		layer.style.visibility = "hidden";
}
function show(layer) 
{
	if (isMinNS4)
		layer.visibility = "show";
	if (ie||dom)
		layer.style.visibility = "visible";
}