Save them as transparent png's
in Photoshop, this can be done via "Save for Web..." option
in Flash, this is done automatically
in older versions of paint, there's a "set Transparency" option
in other drawing programs, you'll probably have to ask someone else.
in Photoshop, this can be done via "Save for Web..." option
in Flash, this is done automatically
in older versions of paint, there's a "set Transparency" option
in other drawing programs, you'll probably have to ask someone else.