Moving Objects over images(ei: BMP's, GIFS, JPEGS...)

        Could someone please send me some information on how to move
text/objects over
pre-made images. I can move objects over backgrounds made by pascal (ei.
LineTo's, Floodfills...) but I haven't been able to take Bitmaps or gifs and
use them as a background for my programs. I would appreciate anything you
can send me.