function display(mode, ele) {
    if (mode == 's'){
      	document.getElementById(ele).style.visibility = 'visible';

      if (ele == 'sub1') 
	{
	document.getElementById('sub2').style.visibility='hidden';
        document.getElementById('sub3').style.visibility='hidden';
        document.getElementById('sub4').style.visibility='hidden';
        document.getElementById('sub5').style.visibility='hidden';
        document.getElementById('sub6').style.visibility='hidden';
        document.getElementById('sub7').style.visibility='hidden';
	document.getElementById('sub8').style.visibility='hidden';
      }
      else if (ele == 'sub2') {
        document.getElementById('sub1').style.visibility='hidden';
        document.getElementById('sub3').style.visibility='hidden';
        document.getElementById('sub4').style.visibility='hidden';
        document.getElementById('sub5').style.visibility='hidden';
        document.getElementById('sub6').style.visibility='hidden';
        document.getElementById('sub7').style.visibility='hidden';
	document.getElementById('sub8').style.visibility='hidden';
      }
      else if (ele == 'sub3') {
        document.getElementById('sub1').style.visibility='hidden';
        document.getElementById('sub2').style.visibility='hidden';
        document.getElementById('sub4').style.visibility='hidden';
        document.getElementById('sub5').style.visibility='hidden';
        document.getElementById('sub6').style.visibility='hidden';
        document.getElementById('sub7').style.visibility='hidden';
	document.getElementById('sub8').style.visibility='hidden';
      }
      else if (ele == 'sub4') {
        document.getElementById('sub1').style.visibility='hidden';
        document.getElementById('sub2').style.visibility='hidden';
        document.getElementById('sub3').style.visibility='hidden';
        document.getElementById('sub5').style.visibility='hidden';
        document.getElementById('sub6').style.visibility='hidden';
        document.getElementById('sub7').style.visibility='hidden';
	document.getElementById('sub8').style.visibility='hidden';
      }
      else if (ele == 'sub5') {
        document.getElementById('sub1').style.visibility='hidden';
        document.getElementById('sub2').style.visibility='hidden';
        document.getElementById('sub3').style.visibility='hidden';
        document.getElementById('sub4').style.visibility='hidden';
        document.getElementById('sub6').style.visibility='hidden';
        document.getElementById('sub7').style.visibility='hidden';
	document.getElementById('sub8').style.visibility='hidden';
      }
      else if (ele == 'sub5') {
        document.getElementById('sub1').style.visibility='hidden';
        document.getElementById('sub2').style.visibility='hidden';
        document.getElementById('sub3').style.visibility='hidden';
        document.getElementById('sub4').style.visibility='hidden';
        document.getElementById('sub6').style.visibility='hidden';
        document.getElementById('sub7').style.visibility='hidden';
	document.getElementById('sub8').style.visibility='hidden';
      }
      else if (ele == 'sub6') {
        document.getElementById('sub1').style.visibility='hidden';
        document.getElementById('sub2').style.visibility='hidden';
        document.getElementById('sub3').style.visibility='hidden';
        document.getElementById('sub4').style.visibility='hidden';
        document.getElementById('sub5').style.visibility='hidden';
        document.getElementById('sub7').style.visibility='hidden';
	document.getElementById('sub8').style.visibility='hidden';
      }
      else if (ele == 'sub7') {
        document.getElementById('sub1').style.visibility='hidden';
        document.getElementById('sub2').style.visibility='hidden';
        document.getElementById('sub3').style.visibility='hidden';
        document.getElementById('sub4').style.visibility='hidden';
        document.getElementById('sub5').style.visibility='hidden';
        document.getElementById('sub6').style.visibility='hidden';
	document.getElementById('sub8').style.visibility='hidden';
      }
      else if (ele == 'sub8') {
        document.getElementById('sub1').style.visibility='hidden';
        document.getElementById('sub2').style.visibility='hidden';
        document.getElementById('sub3').style.visibility='hidden';
        document.getElementById('sub4').style.visibility='hidden';
        document.getElementById('sub5').style.visibility='hidden';
        document.getElementById('sub6').style.visibility='hidden';
	document.getElementById('sub7').style.visibility='hidden';
      }
    }
    else if (mode == 'h') 
	{
        document.getElementById('sub1').style.visibility='hidden';
        document.getElementById('sub2').style.visibility='hidden';
        document.getElementById('sub3').style.visibility='hidden';
        document.getElementById('sub4').style.visibility='hidden';
        document.getElementById('sub5').style.visibility='hidden';
        document.getElementById('sub6').style.visibility='hidden';
	document.getElementById('sub7').style.visibility='hidden';
	document.getElementById('sub8').style.visibility='hidden';
    }
  }