var ns4 = (document.layers);
var ie4 = (document.all && !document.getElementById);
var ie5 = (document.all && document.getElementById);
var ns6 = (!document.all && document.getElementById);

function show(id)
{
	// Netscape 4
	if(ns4){document.layers[id].visibility = "show";}
	// Explorer 4
	else if(ie4){document.all[id].style.visibility = "visible";}
	// W3C - Explorer 5+ and Netscape 6+
	else if(ie5 || ns6){document.getElementById(id).style.visibility = "visible";}
}
function hide(id)
{
	// Netscape 4
	if(ns4){document.layers[id].visibility = "hide";}
	// Explorer 4
	else if(ie4){document.all[id].style.visibility = "hidden";}
	// W3C - Explorer 5+ and Netscape 6+
	else if(ie5 || ns6){document.getElementById(id).style.visibility = "hidden";}
}