background of an image delete the previous image..

Hi! I work whith grx20 in DOS, and I create an image using Context and bitmap: GrImageBuild (2 ways, seperately). I don't know how put the image with the background of the image (black) without deleting the previous image. I think that's the problem itsn't big, but I try in all the ways. Can someone help me? chao! ______________________________________________________ Get Your Private, Free Email at http://www.hotmail.com