I'm trying to add a rollover image where the over image gives just the text and takes on the background element of the cell. but, when creating in photoshop and leaving transparent, it give a white outline around the edge of the transparency. the rest is ok, but i can't get rid of the edge that dreamweaver adds for some reason. any idea what i'm doing wrong?

the background image is a photo, so i can't just fill with the bg color.....

thanks for any help!