Hey yaheardthat, sorry for the delay.
Let's see what we can do.
First, you need to create an image 750px width. White of course; then, in that image, draw a 1px vertical line at 215px from the left. Name it something like fcbg.gif (fc = faux column).
Now, in your CSS, you'll need to modify these selectors:
Now, in the definition of your #insideWrapper selector, replace the background-color:#fff; rule with the following:
background: #fff url(path/to/your/fcbg.gif) top left repeat-y;
Now, in the #sidebar definition, get rid of border-right:1px solid #BABABA; and add the following rule:
That should do it (and I hope I was clear).
If you have any questions, please be patient. I don't think I'll be checking the forums for the rest of the day, but I'll try to do it tomorrow. However, I hope this resolves your issue.