And the jQuery is just that simple!

view plainprint?

1. $(document).ready(function(){  
2.      $("legend").click(function(event){  
3.           if ( $(this).parent().children('div').is('.hidden') ) {  
4.               $(this).parent().children('div').removeClass('hidden') ;  
5.               }  
6.           else {  
7.               $(this).parent().children('div').addClass('hidden') ;  
8.               }  
9.           });  
10.       });  

$(document).ready(function(){
     $("legend").click(function(event){
          if ( $(this).parent().children('div').is('.hidden') ) {
              $(this).parent().children('div').removeClass('hidden') ;
              }
          else {
              $(this).parent().children('div').addClass('hidden') ;
              }
          });
      });

Except I think I will want an external link, so I'll have to add another level of parent(). But jQuery is hardly distinguishable from magic.