$(function () {
        /* jQueryKnob */

        $(".knob").knob({
          /*change : function (value) {
           //console.log("change : " + value);
           },
           release : function (value) {
           console.log("release : " + value);
           },
           cancel : function () {
           console.log("cancel : " + this.value);
           },*/
          draw: function () {

            // "tron" case
            if (this.$.data('skin') == 'tron') {

              var a = this.angle(this.cv)  // Angle
                      , sa = this.startAngle          // Previous start angle
                      , sat = this.startAngle         // Start angle
                      , ea                            // Previous end angle
                      , eat = sat + a                 // End angle
                      , r = true;

              this.g.lineWidth = this.lineWidth;

              this.o.cursor
                      && (sat = eat - 0.3)
                      && (eat = eat + 0.3);

              if (this.o.displayPrevious) {
                ea = this.startAngle + this.angle(this.value);
                this.o.cursor
                        && (sa = ea - 0.3)
                        && (ea = ea + 0.3);
                this.g.beginPath();
                this.g.strokeStyle = this.previousColor;
                this.g.arc(this.xy, this.xy, this.radius - this.lineWidth, sa, ea, false);
                this.g.stroke();
              }

              this.g.beginPath();
              this.g.strokeStyle = r ? this.o.fgColor : this.fgColor;
              this.g.arc(this.xy, this.xy, this.radius - this.lineWidth, sat, eat, false);
              this.g.stroke();

              this.g.lineWidth = 2;
              this.g.beginPath();
              this.g.strokeStyle = this.o.fgColor;
              this.g.arc(this.xy, this.xy, this.radius - this.lineWidth + 1 + this.lineWidth * 2 / 3, 0, 2 * Math.PI, false);
              this.g.stroke();

              return false;
            }
          }
        });
        /* END JQUERY KNOB */
      });