function verschwinden() {
document.getElementById('text').style.display = "block";
}
function verschwinden2() {
document.getElementById('text').style.display = "none";
}
function verschwindenb() {
document.getElementById('textb').style.display = "block";
}
function verschwinden2b() {
document.getElementById('textb').style.display = "none";
}
function verschwindenc() {
document.getElementById('textc').style.display = "block";
}
function verschwinden2c() {
document.getElementById('textc').style.display = "none";
}