Please can someone help, i have been trying all night to do this and it's doing my head in.

I have a shop which i am trying to modify, http://www.sullyworld.co.uk/shop2/index.php

I have removed the right hand boxes, changed the right column width to '0' but the centre column ( ie the product information ) does not span over where the right hand boxes used to be?

Where do i set the width of the centre column, css or in the templates somewhere?

Please help..