There are a few things that can happen with a mouse over:
(1) A screen tip can be displayed, but this is just a short text phrase.
(2) An action setting can be set to play a sound (not what you want
either).
(3) An action setting can be set to hyperlink to another slide; this
might work if that other slide is a copy of this slide except with the
picture bigger.
(4) An action setting can be set to run some VBA code; this code could
cause a large version of the picture to become visible (or even change
teh size of the thumbnail). This could be made to do exactly what you
want, but it would require VBA, something like the following:
Sub MakeBigger(oShp As Shape)
Dim eachShape As Shape
For Each eachShape In _
ActivePresentation.SlideShowWindow.View.Slide.Shapes
If eachShape.Type = msoPicture Then
eachShape.Width = 200
End If
Next eachShape
oShp.Width = 400
End Sub
Sub MakeSmaller()
Dim eachShape As Shape
For Each eachShape In _
ActivePresentation.SlideShowWindow.View.Slide.Shapes
If eachShape.Type = msoPicture Then
eachShape.Width = 200
End If
Next eachShape
End Sub
What you need is to assign the MakeBigger macro to the MouseOver Action
Setting of all your pictures (changing 200 and 400 to whatever size is
appropriate for you). Then create box that covers the whole slide and
send it behind the the pictures and assign it the MakeSmaller macro (also
as a MouseOver Action Setting).
--David
--
David M. Marcovitz
Microsoft PowerPoint MVP
Director of Graduate Programs in Educational Technology
Loyola College in Maryland
Author of _Powerful PowerPoint for Educators_
http://www.PowerfulPowerPoint.com/