Placing Pop Ups

In 2008 I am creating pop ups for a glossary. The problem I have is where on the screen they appear. In edit mode I set them to the X,Y coordinates I want, but when I preview it they are in a different place. What is the trick to placing pop ups where I want them?In 2008 I am creating pop ups for a glossary. The problem I have is where on the screen they appear. In edit mode I set them to the X,Y coordinates I want, but when I preview it they are in a different place. What is the trick to placing pop ups where I want them?

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