function klapptext (id) {
if (document.getElementById("klapptext_" + id).style.display == 'none') {
document.getElementById("show-hide_" + id).style.backgroundImage = "url(../design/pfeil4_2.gif)";
document.getElementById("klapptext_" + id).style.display = "block"; }
else {
document.getElementById("show-hide_" + id).style.backgroundImage = "url(../design/pfeil4_1.gif)";
document.getElementById("klapptext_" + id).style.display = "none"; } }