In powerpoint xp/2002 and above, you can use Empahsis effect > transparency
to dim the text. After you set the transparency on the textbox, the
transparency effect will appear in the effect list (the box that shows all
the effects you have added).
In the list, there is an arrow for you to press, which will show all lines
within the textbox.
Change all of them to "On Click", click and drag them to re-order the
sequence. There is also a Re-Order feature below the effect list.
Also, feel free to check out this additional tutorial which may helps you
further improves the presentation:
"Tutorial on Fading a picture to translucent"
Check the Scenario #2, For Pictures and text.
http://www.freewebs.com/pptheaven/tutorials/FadeToTranslucent.html
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http://www.pptheaven.xs3.com
PowerPoint Heaven - The Power to Animate
Contains tutorials on creating amazing animations for your PowerPoint
Presentations.
====================