in Poser 5  you need to go and edit your   LibraryPrefs.xml  file.  At default installation this is the path you will find it:

C:Program FilesCurious LabsPoser 6Runtimeprefs

In the 4th line look for  previewNum="100"  and change the number to something higher and then save the changes.

"It is good to see ourselves as others see us. Try as we may, we are never
able to know ourselves fully as we are, especially the evil side of us.
This we can do only if we are not angry with our critics but will take in good
heart whatever they might have to say." - Ghandi