Pentax K-X Operating Manual page 106

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Available operations
Four-way controller Moves the selection frame
(Av,_.)
OK button Adds _ and selects an image. Press again to return
to D. Protected images (o-_) cannot be selected.
e-dial Displays a full screen display of the image selected
with the selection frame. When the image is
displayed full screen, press the four-way controller
( _ 1_) to display the previous or next image.
Press the _,UP/_ button.
The delete confirmation screen appears.
Press the four-way controller (A)
to select [Select & Delete].
U Press the
OK
button.
The selected images are deleted.
You can delete the selected folder and all the images in it.
1 Turn the e-dial two clicks to the
left (toward 5€) in Playback
mode.
The folder display screen appears.