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<!doctype html>
<html>
<head>
    <meta charset="UTF-8">
    <title>JavaScript-Beispiel</title>

</head>
<body>
<a href="beispiel.html" onclick="return oeffnen(this.href)">
    Pop-up-Fenster öffnen</a>
<script>
  function oeffnen(url) {
    var fenster = window.open(url, 'f', 'width=500,height=300');
    fenster.focus();
    return false;
  }
</script>
</body>
</html>