HTC Touch Diamond Phone User Manual

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Experiencing Multimedia  18
To view the next or previous image
When viewing images in Portrait or Landscape mode, go to the next image 
by swiping your finger across the screen from right to left. Go back to the 
previous image by swiping your finger from left to right.
To zoom in or out of an image
While viewing an image, make a full circle motion on the screen with your 
finger. 
Slide your finger counter-
clockwise to zoom out. 
Slide your finger clockwise 
on an area to zoom in on 
that area.