Inherit height

[high6ix]

You can view the site of concern here.

The design itself is a main container that has images floated in the upper left, and a sidebar floated on the right.
The problem is...how do I go about making the main container assume the height of the sidebar so that it will extend to the sidebars bottom if the content in itself does not.

I was wanting to use the "inherit" attribute, but that does not seem to work since it is the parent divide itself that is misbehaving.

[mark87]

Without a Javascript solution the alternative is Faux Columns.