/* 
Global "swap" holder 
Use value, null, if no layer initially visible 
*/ 
var currLayerId = "text0";

function togLayer(id) 
{ 
if(currLayerId) setDisplay(currLayerId, "none"); 
if(id)setDisplay(id, "block"); 
currLayerId = id; 
}

function setDisplay(id,value) 
{ 
var elm = document.getElementById(id); 
elm.style.display = value; 
}