var N=""
function cO(z){
 if(document.all){document.all(z).style.visibility="hidden"}else
 if(document.getElementById){document.getElementById(z).style.visibility="hidden"}else
 if(document.layers){document.layers[z].visibility="hide"}
 }
function vO(z){
 if (N!=z&&N!=""){cO(N)}
 if(document.all){document.all(z).style.visibility="visible"}else
 if(document.getElementById){document.getElementById(z).style.visibility="visible"}else
 if(document.layers){document.layers[z].visibility="show"}
 N=z
 }