function show_1() {
    document.getElementById('fragment-1').style.display = 'block';
    document.getElementById('fragment-2').style.display = 'none';
    document.getElementById('fragment-3').style.display = 'none';
    document.getElementById('fragment-4').style.display = 'none';
    document.getElementById('fragment-5').style.display = 'none';
    document.getElementById('m1').className ='active'; 
    document.getElementById('m2').className ='off'; 
    document.getElementById('m3').className ='off'; 
    document.getElementById('m4').className ='off'; 
    document.getElementById('m5').className ='off'; 
  }
  function show_2() {
    document.getElementById('fragment-2').style.display = 'block';
    document.getElementById('fragment-1').style.display = 'none';
    document.getElementById('fragment-3').style.display = 'none';
    document.getElementById('fragment-4').style.display = 'none';
    document.getElementById('fragment-5').style.display = 'none';
    document.getElementById('m2').className ='active'; 
    document.getElementById('m1').className ='off'; 
    document.getElementById('m3').className ='off'; 
    document.getElementById('m4').className ='off'; 
    document.getElementById('m5').className ='off';   
  }   
  function show_3() {
    document.getElementById('fragment-3').style.display = 'block';
    document.getElementById('fragment-1').style.display = 'none';
    document.getElementById('fragment-2').style.display = 'none';
    document.getElementById('fragment-4').style.display = 'none';
    document.getElementById('fragment-5').style.display = 'none';
    document.getElementById('m3').className ='active'; 
    document.getElementById('m1').className ='off'; 
    document.getElementById('m2').className ='off'; 
    document.getElementById('m4').className ='off'; 
    document.getElementById('m5').className ='off';   
  }     
  function show_4() {
    document.getElementById('fragment-4').style.display = 'block';
    document.getElementById('fragment-1').style.display = 'none';
    document.getElementById('fragment-2').style.display = 'none';
    document.getElementById('fragment-3').style.display = 'none';
    document.getElementById('fragment-5').style.display = 'none';
    document.getElementById('m4').className ='active'; 
    document.getElementById('m1').className ='off'; 
    document.getElementById('m3').className ='off'; 
    document.getElementById('m2').className ='off'; 
    document.getElementById('m5').className ='off';   
  } 
  function show_5() {
    document.getElementById('fragment-5').style.display = 'block';
    document.getElementById('fragment-1').style.display = 'none';
    document.getElementById('fragment-2').style.display = 'none';
    document.getElementById('fragment-3').style.display = 'none';
    document.getElementById('fragment-4').style.display = 'none';
    document.getElementById('m5').className ='active'; 
    document.getElementById('m1').className ='off'; 
    document.getElementById('m3').className ='off'; 
    document.getElementById('m4').className ='off'; 
    document.getElementById('m2').className ='off';   
  }