i Cant use playBackwards parameter without repeat parameter enabled

[tipodisimmia]

I need to use playBackwards function without repeat:

    $(document).ready(function(){
        $('#framesLayer').jsMovie({
            sequence : "impegnov01_#####.jpg",    //the #### will be replaced with 0001,0002,0003,...
            folder   : "img/animation/hw/",       //this is the path where the script can find the image sequence
            from     : 0,               //the #### will start to replace with 0001
            to       : 40,              //the #### will start to replace with 0040
            width    : framePlayer.width,             //the advertisement container will be resized to a width of 320px
            height   : framePlayer.height,
            loadParallel: 100,
         repeat:false,
        performStop:true,
        playBackwards:true
            
        });

But when repeat is false the animation doesn't start.