board.gif	- board/background
w_p.gif		- white pawn
w_n.gif		- white knight
w_b.gif		- white bishop
w_r.gif		- white rook
w_q.gif		- white queen
w_k.gif		- white king
b_p.gif		- black pawn
b_n.gif		- black knight
b_b.gif		- black bishop
b_r.gif		- black rook
b_q.gif		- black queen
b_k.gif		- black king

All pieces have a transparent (#FFFFFF) background.