I am having trouble with a Flash SWF file that is not matching up with the
background. It looks lined up in Dreamweaver, but once I view it in Firefox or
Safari (on a Mac) it bumps over about 3 pixels to the left, leaving a white
strip along the righthand side, and offsets it at the bottom left. Any advice
on how to resolve this issue? I'm using a CSS styled background (in order to
set the background to be centered at any browser size) and then I have a table
that is centered.

Here is a screenshot of what I'm seeing:
http://ijdesign.com/MotionWebsite/MotionScreenshot.jpg

Here's the webpage with the HTML code:
http://ijdesign.com/MotionWebsite

I don't have the time to test it, but it looks fine in IE so mabe this error is throwing it off:
<br />

there is a space behind your flash object
</object>
<table width="750" border="0" cellspacing="0" cellpadding="10">

try change it to
</object><br /><table width="750" border="0" cellspacing="0" cellpadding="10">

or put your nested table in another column
<table>
<tr>
<td>flash object here</td>
</tr>
<tr>
<td>navigation table here</td>
</tr>
</table>