function show_image(id) {
        if (document.getElementById('bild1')) { document.getElementById('bild1').style.display = "none"; }
        if (document.getElementById('bild2')) { document.getElementById('bild2').style.display = "none"; }
        if (document.getElementById('bild3')) { document.getElementById('bild3').style.display = "none"; }
        if (document.getElementById('bild4')) { document.getElementById('bild4').style.display = "none"; }
        if (document.getElementById('bild5')) { document.getElementById('bild5').style.display = "none"; }

        document.getElementById(id).style.display = "block";
      }

function show_text(id) {
        if (document.getElementById('text1')) { document.getElementById('text1').style.display = "none"; }
        if (document.getElementById('text2')) { document.getElementById('text2').style.display = "none"; }
        if (document.getElementById('text3')) { document.getElementById('text3').style.display = "none"; }
        if (document.getElementById('text4')) { document.getElementById('text4').style.display = "none"; }
        if (document.getElementById('text5')) { document.getElementById('text5').style.display = "none"; }
        document.getElementById(id).style.display = "block";
      }