Add a speed control x1 to x3 to JW player 6 using JavaScript

I need a speed control for Javascript file for JW player so I can stream vids at speeds that the user controls. Post these things in your application plz 1) Time frame 2) Whether you will deliever sliding scale or fixed interval (i.e) x1 , x1.5, x2.0 speed 3) if you can provide a sample URL to a JW player with sliding scale, only then will I pay.