function showpic(id)
 {
  submenu = document.getElementById('pic'+id);
  for(i=1;i<=50;i++)
  {
   if(i==id)
  {
   submenu.style.display="block";
  }
  else
  {
   document.getElementById('pic'+i).style.display="none";
  }
 }
}

 function closepic(id)
 {
  submenu = document.getElementById('pic'+id);
  for(i=1;i<=30;i++)
  {
   if(i==id)
  {
   submenu.style.display="none";
  }
  }
}