CMS Made Simple Forums

Hi and thanks for any help I may receive
After enabling margin and padding in Layout: Top menu + 2 columns CSS, and then adding any table with cell padding (I use 4px for example with FCKeditorX) to an active content page... magically appears is a margin/gap that will show up on top of the header in FF3.0.3 but not in IE7. I can reinstall and create this every time with no other CSS or template edits. I have been up for 2 nights working at this with no success and I am fairly ok at understanding some code but not really great with CSS yet.
see below image for better understanding


/edit/
forgot to add that a border on the wrapper is also required to make this happen
/* center wrapper, min max width */
div#pagewrapper {
   border: 4px ridge black;
   margin: 0 auto;     /* this centers wrapper */
   max-width: 80em; /* IE wont understand these, so we will use javascript magick */
   min-width: 60em;
   background-color: #fff;;
   color: black;
}

CMS Made Simple 1.4.1 (new install)