function InfoBox(opt_opts) {

  opt_opts = opt_opts || {};

  google.maps.OverlayView.apply(this, arguments);

  // Standard options (in common with google.maps.InfoWindow):
  //
  this.content_ = opt_opts.content || "";
  this.disableAutoPan_ = opt_opts.disableAutoPan || false;
  this.maxWidth_ = opt_opts.maxWidth || 0;
  this.pixelOffset_ = opt_opts.pixelOffset || new google.maps.Size(0, 0);
  this.position_ = opt_opts.position || new google.maps.LatLng(0, 0);
  this.zIndex_ = opt_opts.zIndex || null;

  // Additional options (unique to InfoBox):
  //
  this.boxClass_ = opt_opts.boxClass || "infoBox";
  this.boxStyle_ = opt_opts.boxStyle || {};
  this.closeBoxMargin_ = opt_opts.closeBoxMargin || "2px";
  this.closeBoxURL_ = opt_opts.closeBoxURL || "http://www.google.com/intl/en_us/mapfiles/close.gif";
  if (opt_opts.closeBoxURL === "") {
    this.closeBoxURL_ = "";
  }
  this.infoBoxClearance_ = opt_opts.infoBoxClearance || new google.maps.Size(1, 1);

  if (typeof opt_opts.visible === "undefined") {
    if (typeof opt_opts.isHidden === "undefined") {
      opt_opts.visible = true;
    } else {
      opt_opts.visible = !opt_opts.isHidden;
    }
  }
  this.isHidden_ = !opt_opts.visible;

  this.alignBottom_ = opt_opts.alignBottom || false;
  this.pane_ = opt_opts.pane || "floatPane";
  this.enableEventPropagation_ = opt_opts.enableEventPropagation || false;

  this.div_ = null;
  this.closeListener_ = null;
  this.moveListener_ = null;
  this.contextListener_ = null;
  this.eventListeners_ = null;
  this.fixedWidthSet_ = null;
}
Creates an InfoBox with the options specified in {@link InfoBoxOptions}.
 Call <tt>InfoBox.open</tt> to add the box to the map.
@constructor
@param {InfoBoxOptions} [opt_opts]