src/jquery.nstSlider.js
function (leftPx, rightPx) {
            var $this = this;

            //
            // we need to find a value from the given value in pixels
            //

            // now set the position as requested...
            _methods.set_handles_at_px.call($this, leftPx, rightPx);

            var valueLeftRight = _methods.getSliderValuesAtPositionPx.call($this, leftPx, rightPx),
                leftPxInValue = valueLeftRight[0],
                rightPxInValue = valueLeftRight[1];

            // ... and save the one we've found.
            $this.data('cur_min', leftPxInValue);

            if ($this.data('has_right_grip')) {
                $this.data('cur_max', rightPxInValue);
            }

            return $this;
        }
function (leftPx, rightPx) {
            var $this = this;

            //
            // we need to find a value from the given value in pixels
            //

            // now set the position as requested...
            _methods.set_handles_at_px.call($this, leftPx, rightPx);

            var valueLeftRight = _methods.getSliderValuesAtPositionPx.call($this, leftPx, rightPx),
                leftPxInValue = valueLeftRight[0],
                rightPxInValue = valueLeftRight[1];

            // ... and save the one we've found.
            $this.data('cur_min', leftPxInValue);

            if ($this.data('has_right_grip')) {
                $this.data('cur_max', rightPxInValue);
            }

            return $this;
        }
/*
Set the position of the handles at the specified pixel points (taking
the whole slider width as a maximum point).