// JavaScript Document
function mudavisible( a ){
if (document.getElementById(a).style.visibility== 'visible') 
{
   document.getElementById(a).style.visibility = 'hidden';
   document.getElementById(a).style.display ='none';
 }
else {
  document.getElementById(a).style.visibility = 'visible';
  document.getElementById(a).style.display ='block';
   
}
}