ns4 = (document.layers)? true:false
ie4 = (document.all)? true:false
ns6 = (!document.all && document.getElementById)?true:false

function show(id) {
	if (ns4) document.layers[id].visibility = "show"
	else if (ie4) document.all[id].style.visibility = "visible"
	else if (ns6) document.getElementById(id).style.visibility="visible"
}

function hide(id) {
	if (ns4) document.layers[id].visibility = "hide"
	else if (ie4) document.all[id].style.visibility = "hidden"
	else if (ns6) document.getElementById(id).style.visibility="hidden"
}