function getScrollerWidth() {

                                  var inner = document.createElement('p');
                    inner.style.width = "100%";
                    inner.style.height = "200px";

                    var outer = document.createElement('div');
                    outer.style.position = "absolute";
                    outer.style.top = "0px";
                    outer.style.left = "0px";
                    outer.style.visibility = "hidden";
                    outer.style.width = "200px";
                    outer.style.height = "150px";
                    outer.style.overflow = "hidden";
                    outer.appendChild (inner);

                    document.body.appendChild (outer);
                    var w1 = inner.offsetWidth;
                    outer.style.overflow = 'scroll';
                    var w2 = inner.offsetWidth;
                    if (w1 == w2) w2 = outer.clientWidth;

                    document.body.removeChild (outer);

                    return (w1 - w2);
                }