I’m just saving this for myself for future design possibilities… The script that goes in the head:

<script type="text/javascript">
<!-- 
// toggle visibility 

function toggle( targetId ){ 
  if (document.getElementById){ 
        target = document.getElementById( targetId ); 
           if (target.style.display == "none"){ 
              target.style.display = ""; 
           } else { 
              target.style.display = "none"; 
           } 
     } 
} 
-->
</script>

Sample code showing usage:

<h3>Blogs I Read <a href="#" onclick="toggle('outside2');return false;" title="Toggle BlogRoll">(show/hide)</a></h3> 

    <div id="outside2"> 
        <h1><a href="http://www.google.com" title="google.">Google Search</a><br /> 
        <a href="http://www.google.com" title="google.">Google Search</a></h1> 
        <div class="dailyphoto"><!--#include virtual="/daily/dailyphoto.inc"--></div> 
  </div> 

<h3>Blogs I Read <a href="#" onclick="toggle('outside3');return false;" title="Toggle BlogRoll">(show/hide)</a></h3> 

    <div id="outside3"> 
        <h1><a href="http://www.google.com" title="google.">Google Search</a><br /> 
        <a href="http://www.google.com" title="google.">Google Search</a></h1> 
        <div class="dailyphoto"><!--#include virtual="/daily/dailyphoto.inc"--></div> 
  </div></div>

(via Joel Blain)

iTunes: “World, The” by Quest from the album Essential Chillout (2000, 4:17).