depends what you're saving
save for web
select gif as file type and it should have a transparency checkbox me thinks
(
likeajackhammer,
Wed 28 Feb 2007, 22:49,
archived)
you might also need to hide the background layer if you've selected to have a coloured background
(
likeajackhammer,
Wed 28 Feb 2007, 22:51,
archived)