Photoshop 7.0 making the background transparant

[Gosgood]

I have a simple black and white image (line drawing).  I would like to make everything that is white to be transparant, so that only the lines show.

Currently when I try to move the image onto a colored backgound, the white background comes with it.

Please help

Greg

[Gosgood]

Also, this is a flattened image.  It only has one layer.

I just want to get rid of the white and make it transparent.

Greg

[Michael]

Use Magic Wand to choose the white background and delete.