Uhh... you do realize that your PHP code is being shown the public, right?
<img src="http://ulm.flipabook.com/images/spacer.gif" width="211" height="68" alt=""> </tr>
<? include "i_nav.php" ?>
<title>Flip A Book</title> <tr>
<td bgcolor="#BD1700">
It's very likely that your host has disabled the <? short tag. Either way, I would advise never using the short tags (because of situations just like this one). So, fix all of your PHP tags to be the full <?PHP tag.
Since the issue at hand had nothing to do with PHP, however, I've moved this thread down to the ClientSide Technologies forum.
To comment on your issue... this page is a mess! I would redo it from scratch. You have so many tables inside of tables inside of tables... not only is it not necessary, but it's just plain useless and troublesome. To temporarily fix your issue, try changing this line (just before the <IMG> tag for the headpic image):
<td valign='top' align='left' width='80%'>
to this:
<td valign='top' align='center' width='80%'>