[monolithed]

Хозяйке на заметку:

<script type="text/javascript">
window.onload = function(){
     document.getElementsByTagName('a')[0].onclick = function(){
          var div = document.getElementsByTagName('div')[0];
          div.style.display = (div.style.display == '') ? 'block' : '';
      };
 };
</script>

<style type="text/css">
div {background: red; display: none; width: 50px; height: 50px;}
</style>

<a href="#">click</a>
<div></div>