Use the Animations Tab in PowerPoint 2007
PowerPoint’s animation effects fall into two categories: slide transitions and slide animations. Both types of animations are controlled from the Animations tab on the PowerPoint Ribbon.
The Animations tab consists of three groups of controls, as described in the following list:
Preview: This group includes a Preview button that displays a preview of the animation effects you selected for the current slide.
Animations: This group lets you create animation effects. You can select a predefined effect from the Animate drop-down list, or you can click the Custom Animation button to specify a custom animation.
Transition to This Slide: This group lets you set the transition effect that’s used when the slide is displayed.