$(document).ready(function(){
  $("span.button+ul").hide();
  $("span.button")
    .filter(".dummy")
      .click(function(){
	alert("This is just an example, to show you what the Categories look like.\nAll it does is bring up this box!");
      })
    .end()
    .filter(".collapse")
      .click(function(){
	$("span+ul").hide("slow")
      })
    .end()
    .filter(".expand")
      .click(function(){
	$("span+ul").show("slow")
      })
    .end()
    .not(".dummy,.collapse,.expand")
      .click(function(){
	if ( $(this).next().is(':visible') )
	  $(this).next().hide("slow");
	else
	  $(this).next().show("slow");
      })
    .end();
});