JTrackBar水平拖动效果

        oTrackArea.style.styleFloat = "left";
        oTrackArea.style.cssFloat    = "left";
    }

    var recalcTrackArea = function(){
        var w_ = parseInt(getRunStyle(oArrBtnLeft,"width"));
        trackAreaWidth = outlineWidth - 2 * w_;        
        preFrequenceWidth = trackAreaWidth / (maxPosition - minPosition);

        oTrackArea.style.width = trackAreaWidth + "px";
    }

    var pointer_mousedown = function(evt){
        inDrag = true;
        dragStartPos = JPos.getMousePos(evt);
        body.onmousemove = pointer_mousemove;
        body.onmouseup = pointer_mouseup;
        body.onmouseout = pointer_mouseout;
    }

    var pointer_mousemove = function(evt){
        if(!inDrag)    return;
        //evt = window.event || evt;
        //var x_ = evt.clientX;
        //window.status = x_ + " " + dragStartPos.x;
        //self.setPositionBy(x_ - dragStartPos.x);

        //window.status += " " +  evt.clientX;

        var mPos = JPos.getMousePos(evt);
        var pos_ = JPos.getAbsPos(oTrackArea);

        self.setPosition(parseInt((mPos.x - pos_.x) / preFrequenceWidth));        
    }

    var pointer_mouseup = function(){
        inDrag = false;
    }

    var pointer_mouseout = function(){
        //inDrag = false;
    }

    var createHPointer = function(){