function show1() {
       var box1 = document.getElementById('box1');
       var box2 = document.getElementById('box2');
          box1.style.display = 'block';
          box2.style.display = 'none';
    }
    function show2() {
       var box1 = document.getElementById('box1');
       var box2 = document.getElementById('box2');
          box2.style.display = 'block';
          box1.style.display = 'none';
    }