To insert your gif image as a background, click Format > Background.
Click on the dropdown button and select Fill Effects.
Click on the Picture tab, click Select Picture.
Look for the .gif, and click Ok.
Click Apply to All. (This will apply the background to all slides).
Alternately, click View > Master > Slide Master.
Insert your .gif image through Insert > Picture > From File.
Send the image to back, then close master view.
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Shawn Toh (tohlz)
Microsoft MVP PowerPoint
Site Updated: Nov 15, 2006
Added PowerPoint 2007 Visual Tour (OfficeArt Effects)
http://pptheaven.mvps.org
PowerPoint Heaven - The Power to Animate