function jsScroller (o, w, h) {
  var self = this;
  var list = o.getElementsByTagName("div");
  for (var i = 0; i < list.length; i++) {
    if (list[i].className.indexOf("Scroller-Container") > -1) {
      o = list[i];
    }
  }
  
  this._setPos = function (x, y) {
    if (x < this.viewableWidth - this.totalWidth) 
      x = this.viewableWidth - this.totalWidth;
    if (x > 0) x = 0;
    if (y < this.viewableHeight - this.totalHeight) 
      y = this.viewableHeight - this.totalHeight;
    if (y > 0) y = 0;
    this._x = x;
    this._y = y;
    with (o.style) {
      left = this._x +"px";
      top  = this._y +"px";
    }
  };
  
  this.reset = function () {
    this.content = o;
    this.totalHeight = o.offsetHeight;
    this.totalWidth   = o.offsetWidth;
    this._x = 0;
    this._y = 0;
    with (o.style) {
      left = "0px";
      top  = "0px";
    }
  };
  this.scrollBy = function (x, y) {
    this._setPos(this._x + x, this._y + y);
  };
  this.scrollTo = function (x, y) {
    this._setPos(-x, -y);
  };
  this.stopScroll = function () {
    if (this.scrollTimer) window.clearInterval(this.scrollTimer);
  };
  this.startScroll = function (x, y) {
    this.stopScroll();
    this.scrollTimer = window.setInterval(
      function(){ self.scrollBy(x, y); }, 40
    );
  };
  this.swapContent = function (c, w, h) {
    o = c;
    var list = o.getElementsByTagName("div");
    for (var i = 0; i < list.length; i++) {
      if (list[i].className.indexOf("Scroller-Container") > -1) {
        o = list[i];
      }
    }
    if (w) this.viewableWidth  = w;
    if (h) this.viewableHeight = h;
    this.reset();
  };
  
  this.content = o;
  this.viewableWidth  = w;
  this.viewableHeight = h;
  this.totalWidth   = o.offsetWidth;
  this.totalHeight = o.offsetHeight;
  this.scrollTimer = null;
  this.reset();
};