Length of document messes up page

I will be displaying documents of varying length. I see that I can set the length of the display for the doc in pixels. However, if a doc is longer, I noticed that the plug in creates a long page and just shows 900px of it using the scroll bar. I noticed in the rendered code that there appears to be a random <div> block that’s causing the problem (I can send a screenshot if that would help).

Also, it would be helpful if I could set height and width in percentage or pixels rather than just pixels. It would provide more flexibility.

The page I need help with: [log in to see the link]