beamer and preview

hi list,

when I use beamer with texshop, I have problems with getting preview  
to do what I want, namely:

when I use the page-up or page-down keys of my keyboard, it doesn't  
jump slidewise, but depending on the actual size of the window, such  
that I e.g. see the lower half of one slide and the upper half of the  
next one.

is there a possibility to change this behaviour?

tia
d

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