function setFoto() {
            document.getElementById('foto').style.visibility = 'visible';
            document.getElementById('foto').style.display = '';
            document.getElementById('blanco').style.visibility = 'hidden';
            document.getElementById('blanco').style.display = 'none';
            document.getElementById('video').style.visibility = 'hidden';
            document.getElementById('video').style.display = 'none';
        }
        function setBlanco() {
            document.getElementById('blanco').style.visibility = 'visible';
            document.getElementById('blanco').style.display = '';
            document.getElementById('foto').style.display = 'none';
            document.getElementById('foto').style.visibility = 'hidden';
            document.getElementById('video').style.visibility = 'hidden';
            document.getElementById('video').style.display = 'none';
        }
        function setVideo() {
            document.getElementById('video').style.visibility = 'visible';
            document.getElementById('video').style.display = '';
            document.getElementById('foto').style.visibility = 'hidden';
            document.getElementById('foto').style.display = 'none';
            document.getElementById('blanco').style.visibility = 'hidden';
            document.getElementById('blanco').style.display = 'none';

        }