[jQuery] Better accordeon for my website.

[Popech]

Hello.

I'd like to ask you how I could have an accordeon menu with standart
effects (slideUp & slideDown) with the following option :
- If I click on a submenu already visible, I don't want it  to slide
up and down (beautiluf but not useful)

For the rest, I use :

$(document).ready(function(){
     $("#blogextra ul:not(:first)").hide();
     $("#blogextra h2").click(function(){
          $("#blogextra ul:visible").slideUp("slow");
          $(this).next().slideDown("slow");
          return false;
     });
     $("#blogextra h2").mouseover(function () {
          $(this).css("cursor","pointer");
     });
});

Example : http://www.sakeco.net/blog (on the right side)

Greetings from France,
Popech