ns4 = (document.layers)? true:false
ie4 = (document.all)? true:false
dom = (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 (dom) document.getElementById(id).style.visibility = "visible";
	
	if (ie4) document.all[id].style.display = ""
	else if (ie4) document.all[id].style.display = ""
	else if (dom) document.getElementById(id).style.display = "";
}

function hide(id) {
	if (ns4) document.layers[id].visibility = "hide"
	else if (ie4) document.all[id].style.visibility = "hidden"
	else if (dom) document.getElementById(id).style.visibility = "hidden";
	
	if (ie4) document.all[id].style.display = "none"
	else if (ie4) document.all[id].style.display = "none"
	else if (dom) document.getElementById(id).style.display = "none";	
}