javascript - addEvent not working while setting a Slide element -

i'm making html5 videoplayer mootools, , progress bar 'slide' element wich update periodically. when that, click event canceled on element.

here's slider:

this.options.timeslider = new slider(timeprogress, timeknob, {     range: [0, 100],     steps: 1000,     initialstep: 0,      onchange: function(value) {         this.setprogress(value);     }.bind(this) }); 

then there's settime function wich fired periodically every second:

settime: function() {     var percentage = this.options.video.currenttime / this.options.video.duration * 100;      if(!isfinite(percentage)) {         percentage = 0;     }      this.options.timeslider.set(percentage); } 

you can check full code, can find here: http://j.blck.lv/code/41081i1g3y2v