Make sure to flush your browser cache. Otherwise it won't see the new images, because it uses the cached directory listing for seeing what pieces are there.
Well if you have a piece that does have a defined move, you could move any piece you want to get rid of in its path, (through an illegal move to an empty square, which is always accepted), capture it with that, and then move it back. I agree this is more cumbersome, but I don't know how often thise works.
I don't know what variant you are using this for, but when you want Alfaerie pieces, you could also use the Play-Test Applet, which uses these by default. There you can define the correct moves, and if you want whole-board images, you can just take screenshots of it.
Make sure to flush your browser cache. Otherwise it won't see the new images, because it uses the cached directory listing for seeing what pieces are there.
Well if you have a piece that does have a defined move, you could move any piece you want to get rid of in its path, (through an illegal move to an empty square, which is always accepted), capture it with that, and then move it back. I agree this is more cumbersome, but I don't know how often thise works.
I don't know what variant you are using this for, but when you want Alfaerie pieces, you could also use the Play-Test Applet, which uses these by default. There you can define the correct moves, and if you want whole-board images, you can just take screenshots of it.