Alert Quick Time TAKING over GIF's and JPG's

1. Transparent GIF's/JPG's

I've just started to write HTML and now I'm about to make a homepage.
I don't know so much, but somewhere, somehow,  I read something about
a program that could convert gif's and jpg's so that the backround
colour became transparent. I would be very thankfull if anybody could
give me the URL to this program so I can download it, acording to what
I remember, the program was shareware/freeware.


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