function _checkRight(targetOffset, tooltipLayerStyleLeft, tooltipOffset, windowSize, tooltipLayer) {
    if (targetOffset.left + tooltipLayerStyleLeft + tooltipOffset.width > windowSize.width) {
      // off the right side of the window
      tooltipLayer.style.left = (windowSize.width - tooltipOffset.width - targetOffset.left) + 'px';
      return false;
    }
    tooltipLayer.style.left = tooltipLayerStyleLeft + 'px';
    return true;
  }
Set tooltip left so it doesn't go off the right side of the window

@return boolean true, if tooltipLayerStyleLeft is ok.  false, otherwise.