var all, layers, getElementById;

all = document.all;
layers = document.layers;
getElementById = document.getElementById && !document.all;


//var x="";
var x="chin";




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

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