[Moo] Small piece of code working with mootools 1.1. but not working with mootools 1.2.

[coakley]

Hello,
I've got a small piece of code for a slider working correctly with
mootools 1.1. but not with 1.2
Would be great if someone could help me out.
/**********************************************/
The mootools 1.1. code
/************************************************/
window.addEvent('domready', function(){
         var totIncrement              = 0;
         var increment                 = 942;
         var maxRightIncrement = increment*(-1);
         var fx = new Fx.Style('myList', 'margin-left', {
                               duration: 1500,
                               transition:
Fx.Transitions.Back.easeInOut,
                               wait: true
          });

          //-------------------------------------
         // EVENTS for the button "previous"
         $('previous').addEvents({
         'click' : function(event){
                 if(totIncrement<0){
                                       totIncrement = totIncrement
+increment;
                                       fx.stop()
                                       fx.start(totIncrement);
                               }
                       }
     });

      //-------------------------------------
         // EVENTS for the button "next"
         $('next').addEvents({
         'click' : function(event){
                        if(totIncrement>maxRightIncrement){
                                totIncrement = totIncrement-increment;
                       fx.stop()
                               fx.start(totIncrement);
                       }
         }
     })


});

/********************************************/
The mootools 1.2. code
/*******************************************/
window.addEvent('domready', function(){
var totIncrement = 0;
var increment = 387;
var totalIncrements = $$("#Mylist li").length - 1
var maxRightIncrement = increment*(- totalIncrements);

var fx = new Fx.Tween('Mylist', {
  property: 'margin-left',
  duration: 1000,
  transition: Fx.Transitions.Back.easeInOut,
  onStart: function() {
     $("previous").removeEvents('click');
     $("next").removeEvents('click');
  },
  onComplete: function() {
     appEvent();
  }
});

function appEvent() {
  // Previous Button
  $('previous).addEvents({
     'click' : function(event){
        if(totIncrement<0){
           event.stop();
           totIncrement = totIncrement + increment;
           fx.start(totIncrement);
       }
     }
  });

  // Next Button
  $('next').addEvents({
     'click' : function(event){
        if(totIncrement>maxRightIncrement){
           event.stop();
           totIncrement = totIncrement - increment;
           fx.start(totIncrement);
       }
     }
  });
}
appEvent();
 });