Untitled

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>JS Bin</title>
</head>
<body>
  <button onclick="random()">click</button>
  <p id="aantal">ll</p>


  <script>


  </script>
<script id="jsbin-javascript">
 var cursos = ["lala", "lele", "lili", "okok", "yyy"];


var max = cursos.length;

function random(){
  var rnd = Math.floor(Math.random() * max);
   document.getElementById("aantal").innerHTML = cursos[rnd];
}
</script>


<script id="jsbin-source-javascript" type="text/javascript"> var cursos = ["lala", "lele", "lili", "okok", "yyy"];


var max = cursos.length;

function random(){
  var rnd = Math.floor(Math.random() * max);
   document.getElementById("aantal").innerHTML = cursos[rnd];
}</script></body>
</html>