Is there anyway to have both the left (ie. menu) and right (ie. polls) blocks appear when accessing http://WWW.MYSITE.COM, but when I want to go deeper into the site, remove the right blocks. For example, leave the menu on the screen, but remove the poll?

When accessing, say, the categories or sections, I put the focus on the content by removing the right-side blocks. This would still allow for navigation via the menu and login/logout on the left.

Thanks for your help!