Bestsellers in Ideal Responsive Template
 

The CSS in the Ideal Responsive template is doing my head in - I don't want to hack away at it in case I mess things up for a different screen size that I haven't tested, so this is what should be a straightforward question for those in the know ;)

The Welcome page in this template puts the Bestsellers menu in a right-hand column, whereas all other pages in the site shunt it over to the standard left column. I'd like the Welcome page to have Bestsellers in the left column, but match the rest of the site with 100% of the remaining page width given over to products/product details.

I can move the Bestsellers to the left on the Welcome page, but I still get a space on the right and the products don't fill the gap.

Any suggestions would be most welcome!