// script zum vergrößern und verkleinern von css boxen 

function show_a() {
  var gross = document.getElementById("block_1a");
  gross.style.height = "auto";

  var link = document.getElementById("link_1a");
  link.style.display = "none";

  var linkb = document.getElementById("link_1b");
  linkb.style.display = "inline"; // inline / block / list-item / none
  }

function close_a() {
  var gross = document.getElementById("block_1a");
  gross.style.height = "1px";

  var link = document.getElementById("link_1a");
  link.style.display = "inline";

  var linkb = document.getElementById("link_1b");
  linkb.style.display = "none";
  }