There isn't a direct way.
Here's how you can do it:
Click View > Master > Slide Master.
If you have a watermark image, insert it on the content master. If not, you
can insert text or WordArt onto the content master.
Next, click Slide Show > Custom Animation.
Select the watermark, click Add Effect > Emphasis > Transparency.
Set the Start to "After Previous".
Close Master View.
Hope it helps.
--
Shawn Toh (tohlz)
Microsoft MVP PowerPoint
Site Updated: August 29, 2007
(Amazing PowerPoint animations, artworks, games here)
http://pptheaven.mvps.org
PowerPoint Heaven - The Power to Animate
