function show(id){ 
if (document.getElementById){ 
obj = document.getElementById(id); 
if (obj.style.display == "none"){ 
obj.style.display = ""; }
 } } 
function hide(id){ 
if (document.getElementById){ 
obj = document.getElementById(id); 
if (obj.style.display == ""){ 
obj.style.display = "none"; }
 } }