http://coopkonzum.cz/styles/jmenu.js

1/*jQuery menu
2Example:
3$(document).ready(function(){
4  $('#jmenu').jmenu({animation:'fade',duration:100});
5});
6(c) 2010 Sawanna Team (http://sawanna.org)*/
7var jmenu={
8    effect: 'show',           /* default animation effect */
9    duration: 1,         /* default duration */
10    set: function (settings){
11       try{
12         if (settings.animation == 'show') { this.effect='show'; }
13         if (settings.animation == 'slide') { this.effect='slide'; }
14         if (settings.animation == 'fade') { this.effect='fade'; }
15        } catch (e) {}  
16        try{
17          this.duration=settings.duration;
18        } catch (e) {} 
19    },
20    fix_pos:function(elem){
21      if ($(elem).parent('ul').parent('li').length){
22        $(elem).children('ul').eq(0).css({marginTop:-$(elem).height(),marginLeft:$(elem).width()});
23      } else{
24          $(elem).children('ul').eq(0).css({'top':$(elem).offset().top+$(elem).height(),'left':$(elem).offset().left});
25      }
26    },
27    show:function(elem){
28      if (this.effect=='fade') { $(elem).children('ul').eq(0).stop(1,1).fadeIn(this.duration); }
29      else if (this.effect=='slide') {$(elem).children('ul').eq(0).stop(1,1).slideDown(this.duration); }
30      else if (this.effect=='show') { $(elem).children('ul').eq(0).stop(1,1).show(this.duration); }
31    },
32    hide: function(elem){
33      $(elem).children('ul').eq(0).stop(1,1).fadeOut(1);
34    }
35}
36jQuery.fn.jmenu=function(settings){
37jmenu.set(settings);
38$(this).find('li').each(function(){
39  $(this).hover(
40    function(){
41      jmenu.fix_pos(this);
42      jmenu.show(this);
43    },
44    function() {
45      jmenu.hide(this);
46    }
47  );
48 });
49}