Ok, that helps.
The first thing to note is that you can't change the background itself like
this (at least not without VBA, although that might be a possiblity), but
you can instead animate a slide-sized image in to cover the slide. If you
use the Order tools on the Drawing toolbar to "send to back," then the image
will come in behind all your text and objects and stuff -- so it will
effectively serve as the slide background.
That said, I can think of a couple of ways to go about it.
One would be to use a trigger animation. Basically, you'd trigger a
slide-sized image to enter when you click the bullet point text. That might
be a pain, though, especially since it seems you have your bullets set to
animate on mouseclick -- not set to animate *when the bulleted text itself*
is clicked with the mouse.
http://www.echosvoice.com/triggers.htm has a
quick tutorial on triggers if you're interested in how those work.
The easier way would be to animate the slide-sized image as an automatic
entrance immediately following the animation of each bullet point.
http://www.echosvoice.com/individualbullets.htm#IndividualBulletedTextAnimation
has a tutorial on animating individual bullets. The important thing here is
expanding the list so you can intersperse things between the bullet
animations. You'd expand your bulleted text animation list, then you'd add
entrance animations to your "background" images and drag them into place in
the Custom Animation task pane so that each image comes right after the
appropriate bullet point. Set each image animation to start "With Previous,"
and the images should then change when you click the mouse to change the
text.
Make sense?
If necessary, you could add an exit animation to each previous image as well
so that it disappears as the next image comes in. Holler if you need help
setting that up.
--
Echo [MS PPT MVP]
http://www.echosvoice.com
presenter, PPT Live '04
Oct 10-13, San Diego
http://www.powerpointlive.com