// script zum anzeigen und verkstecken von css boxen 

function link_1() {
  var gross = document.getElementById("link_1");
  gross.style.visibility = "visible";
  }
function link_off() {
  
  var date = new Date();
  var curDate = null;
  var millis = 200;
  
  do { curDate = new Date(); }
  while(curDate-date < millis);

  var gross = document.getElementById("link_1");
  gross.style.visibility = "hidden";  // bei "visible" bleibt das 1. bild stehen. sonst "hidden"
  
  var gross1 = document.getElementById("link_2");
  gross1.style.visibility = "hidden";
  
  var gross2 = document.getElementById("link_3");
  gross2.style.visibility = "hidden";

  var gross3 = document.getElementById("link_4");
  gross3.style.visibility = "hidden";

  var gross4 = document.getElementById("link_5");
  gross4.style.visibility = "hidden";

  var gross5 = document.getElementById("link_6");
  gross5.style.visibility = "hidden";

  var gross6 = document.getElementById("link_7");
  gross6.style.visibility = "hidden";

  var gross7 = document.getElementById("link_8");
  gross7.style.visibility = "hidden";

  var gross8 = document.getElementById("link_9");
  gross8.style.visibility = "hidden";

  var gross9 = document.getElementById("link_10");
  gross9.style.visibility = "hidden";
  }

function link_2() {
  var gross = document.getElementById("link_2");
  gross.style.visibility = "visible";
  }

function link_3() {
  var gross = document.getElementById("link_3");
  gross.style.visibility = "visible";
  }

function link_4() {
  var gross = document.getElementById("link_4");
  gross.style.visibility = "visible";
  }

function link_5() {
  var gross = document.getElementById("link_5");
  gross.style.visibility = "visible";
  }

function link_6() {
  var gross = document.getElementById("link_6");
  gross.style.visibility = "visible";
  }

function link_7() {
  var gross = document.getElementById("link_7");
  gross.style.visibility = "visible";
  }

function link_8() {
  var gross = document.getElementById("link_8");
  gross.style.visibility = "visible";
  }

function link_9() {
  var gross = document.getElementById("link_9");
  gross.style.visibility = "visible";
  }

function link_10() {
  var gross = document.getElementById("link_10");
  gross.style.visibility = "visible";
  }