mBorderStyle[aSide] |= (BORDER_COLOR_DEFINED | BORDER_COLOR_TRANSPARENT);
mBorderStyle[aSide] |= BORDER_COLOR_TRANSPARENT;
  void SetBorderTransparent(PRUint8 aSide)  {    NS_ASSERTION(aSide <= NS_SIDE_LEFT, "bad side");     mBorderStyle[aSide] &= ~BORDER_COLOR_SPECIAL;    mBorderStyle[aSide] |= (BORDER_COLOR_DEFINED | BORDER_COLOR_TRANSPARENT);   }