val=0;
function menu(val){
document.getElementById('bar').style.display='none';
document.getElementById('bar1n').style.display='none';
document.getElementById('bar2n').style.display='none';
document.getElementById('bar3n').style.display='none';
document.getElementById('bar4n').style.display='none';
document.getElementById('bar5n').style.display='none';
document.getElementById('bar7n').style.display='none';

switch (val) {
  case 0:


  break;  

case 1:

document.getElementById('bar1n').style .display='block';
document.getElementById('bar').style .display='block';

  break;

  case 2:
document.getElementById('bar2n').style .display='block';
document.getElementById('bar').style .display='block';

  break;


  case 3:
document.getElementById('bar3n').style .display='block';
document.getElementById('bar').style .display='block';

  break;

  case 4:
document.getElementById('bar4n').style .display='block';
document.getElementById('bar').style .display='block';

  break;

  case 5:
document.getElementById('bar5n').style .display='block';
document.getElementById('bar').style .display='block';

  break;

  case 7:
document.getElementById('bar7n').style .display='block';
document.getElementById('bar').style .display='block';

  break;




  }


}