resizing problem

hi everyone,
i tried to resize template from it's settings page, i set global width to 1200, left column to 240 a right column to 260 pixel.
everythiong seems ok but in category blog layout it happens an error
as you can see at this address:
www.bambuseto.it/lavori/partecipazioni

i tried to force table class "blog" to 700 pixels width without any result.
i noticed that when i have few articles and they dispose in only one column i have no problem, but when i put more articles and joomla dispose them in the classic blog layout it seems that the the two columns under the first article don't fit the 50% width of the main table (as you can see) but they fit the 50% of something else...

what can i do?

tanks,
roberto

set only one column in menu item parameters.

ok, this is an "extreme" solution.

there is no way to let the 2 column layout resize correctly?

thanks

No it's not supported by layout design