Transparent images

[Sarah]

AAARGGHHHH! I've done this before and now I can't get it to work. I am 
importing an image and I can't get the background to be transparent. I 
am using GraphicConvertor as my image editor and I have tried both PNG 
& GIF files, both with the background color set to transparent. In GC 
the background is shaded out and in the Finder it is greyed out. As 
soon as I import, the background goes back to opaque white and I can't 
do anything about it.

This is driving me crazy, so I anyone has any ideas, please help!

Sarah