function _checkLeft(targetOffset, tooltipLayerStyleRight, tooltipOffset, tooltipLayer) {
    if (targetOffset.left + targetOffset.width - tooltipLayerStyleRight - tooltipOffset.width < 0) {
      // off the left side of the window
      tooltipLayer.style.left = (-targetOffset.left) + 'px';
      return false;
    }
    tooltipLayer.style.right = tooltipLayerStyleRight + 'px';
    return true;
  }
Set tooltip right so it doesn't go off the left side of the window

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