The background color on this div will only show for the length of the content. If you'd like a dividing line instead, place a border on the left side of the #mainContent div if the #mainContent div will always contain more content than the #sidebar1 div.
sidebar1 Content
Advertising Content
T-shirts are done!
Any color you want, as long as its black! (although there are a limited number of brown shirts as well, since brown IS the new black!)
