nn4=(document.layers)?1:0;
ie4=(document.all)?1:0;
isMac = (navigator.appVersion.indexOf("Mac")!=-1) ? 1 : 0;
NS4 = (document.layers) ? 1 : 0;
IE4 = (document.all && !isMac) ? 1 : 0;
ver4 = (NS4 || IE4) ? 1 : 0;

function ukryj(ident) {
	if(document.layers){
		document.layers[ident].visibility="hide";
	}else if(document.all){
		document.all[ident].style.visibility="hidden";
	}
}

function pokaz(ident) {
	if(document.all){
		document.all[ident].style.visibility="visible";
	}else if(document.layers){
		document.layers[ident].visibility="show";
	};
}