Background image appearing in Edit mode

HI,
My experience level
~~~~~~~~~~~~
I'm a newbie as well although have been playing with Drupal for some 6 months now and have a good feel for it's capabilities.

I'm a business analyst and not a developer. I know a little HTML and very basic CSS stuff but no PHP experience.

My issue
~~~~~
I've created a site (Drupal 5.7) and have installed the ubiquity theme. I have also installed TinyMCE that is using the theme's css so that the whole site is consistent.

However, the theme uses a background image and TinyMCE is using that image for the background of the content "body" of say, a page, when it edit mode.

Research
~~~~~~
I searched the FAQ's and all the forums and although I have found some similar issues none of those solutions seemed to work for me.

I tried changing the style.css of the theme (ie:
FROM
body {
background: #efeeea url('images/bodybg.png') repeat-x top center;
}

TO
body {
background-color: #fff;
}

This worked but the theme changed as it was no longer using the image specified in the theme and thus was not a suitable solution.

I figured that I needed to somehow change the theme so that the reference to this body tag was pointing to something else (and thus change the body tag to just have a white background) and have the new tag = to the orginal body tag or alternatively get TinyCME to use some other body tag.

I tried playing around with this but could not get these working at all either.
After spending a couple of days on this, I have not been able to get any closer to a solution.

I've read these issues and some are a little over my head and others did not resolve the issue:
http://drupal.org/node/166236 (this was a little over my head)
http://drupal.org/node/117004 (this solution didn't work but appears to be the same problem as what I am experiencing).

Can anyone assist me in this?

I am sure it is a very simple solution (and a common one) so I am hoping someone could take a quick look and assist me with a solution.

Thank you in advance.