O'Reilly NOOK Manual page 354

At the top of the screen, you find several important buttons and pieces of infor-
mation. Right in the center of the screen at the top, you see the folder you're
currently in (again, Gmail calls them labels), the number of messages in that
folder that have been downloaded to your NOOK Tablet, and where the current
email is on that list, for example three out of 25.
To the left of that there's a Back arrow. Tap Back to go back to the enclosing
folder. To its right you'll see an up arrow and a down arrow. Tap the up arrow to
read the previous mail in the folder; tap the down arrow to read the next.
Handling Pictures in Mail
You'll often get sent pictures in email. Some are embedded in the content of the
message itself—for example, a company logo, or when someone has pasted a
picture directly into the message. Other times, the sender attaches the image to
the messages, like a family member sending you Thanksgiving photos.
If the graphics are embedded in the content of the message, you see a button
titled Show pictures. In some cases you don't really need to see the graphics
(who cares what a company's logo looks like, really?). In that case, do nothing,
However, in other cases, the graphic is an integral part of the message, like a
graph or a map. If that happens, tap "Show pictures". You see all the graphics
on full display, right in the message.
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