My apologies.. I didn't see the link.

Cullinanweb wanted you to put both the left and right columns in a wrapper div.

You do not currently have those columns in a wrapper.

Faux columns is the only way I know how to do this.
You make a background image that will repeat-y. Apply it as the background to the wrapper div.

Then you nest the left and right columns in the wrapper- No colored backgrounds on the left or right.

Without faux columns you will never get the two columns to appear to match in length.