.left  { background: url(../_gfx/brd_comm_left.gif) repeat-y left top }
.right  { background: url(../_gfx/brd_comm_right.gif) repeat-y right top }
.btm  { background: url(../_gfx/brd_comm_btm.gif) no-repeat center bottom }
.top  { background: url(../_gfx/brd_comm_top.gif) no-repeat center top }