Haaa! 

So here's the thing - this is actually something I raised some time ago (here), and its actually been logged (here) by Timo and me as an issue that will hopefully be fixed in the near future...  You'll read (and would have noticed) that the FCK Image Gallery also takes on the body styles of your CSS - a problem if you have a dark background.  There's a bit of a fix for this that you can add to you skin.css below:

/*--- Styles to curb FCK Link & Image Gallery #body issue ---*/
.FCKLinkGalleryContainer {
    background-color: #fff;
}
.FCKImageGalleryContainer {
    background-color: #fff;
}

Though you can still see a bit of the body showing in the pane, at least with this bit of CSS, the containing table is white.  Hope it helps out.

Thanks
Jon

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