window.onload = function(){
 $("a.expand").toggle( 
  function(){
   $(this).css( "background-image", "url( /images/sm-max.gif )" );
   $(this).parent().children("ul").slideUp();
  },
  function(){
   $(this).css( "background-image", "url( /images/sm-min.gif )" );
   $(this).parent().children("ul").slideDown();
  }
 );
}