There is a very easy fix for this problem, what you have to do is move you cursor to the top or bottom of the page and move your cursor around the very top edge of the page until it turns from a pointer to something that looks like two arrows pointing in opposite directions. There will be a little pop up under the cursor that says show white space. You can use this same trick to colapse the with space again.
This is how it works in Office 2003, that is what I assume you are using.
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