function onoff1 () {
  if (document.getElementById)
    document.getElementById("Br1").style.display = "none";
    document.getElementById("Br1weg").style.display = "";
    }
function on1 () {
  if (document.getElementById)
    document.getElementById("Br1").style.display = "";
    document.getElementById("Br1weg").style.display = "none";
    }
function onoff2 () {
  if (document.getElementById)
    document.getElementById("Br2").style.display = "none";
    document.getElementById("Br2weg").style.display = "";
    }
function on2 () {
  if (document.getElementById)
    document.getElementById("Br2").style.display = "";
    document.getElementById("Br2weg").style.display = "none";
    }
function onoff3 () {
  if (document.getElementById)
    document.getElementById("Br3").style.display = "none";
    document.getElementById("Br3weg").style.display = "";
    }
function on3 () {
  if (document.getElementById)
    document.getElementById("Br3").style.display = "";
    document.getElementById("Br3weg").style.display = "none";
    }
function onoff4 () {
  if (document.getElementById)
    document.getElementById("Br4").style.display = "none";
    document.getElementById("Br4weg").style.display = "";
    }
function on4 () {
  if (document.getElementById)
    document.getElementById("Br4").style.display = "";
    document.getElementById("Br4weg").style.display = "none";
    }