I like PNGs myself, but see:
Graphics/Transparency/Etc.
http://www.rdpslides.com/pptfaq/FAQ00224.htm
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I had tried importing all the wrong media types ... copying and pasting didn't work either. Tried saving the object (after removing white background) as .png ... WORKED GREAT!!! Thanks
Sonia Coleman
Microsoft PowerPoint MVP Team
Autorun Software, Templates and Tutorials
http://www.soniacoleman.com