delete CATEGORY word into categories link and show posts imediately when click on categories

On this web site in wordpress ITALIAN 2.5: [login to view URL] I need to do 2 little works: 1) Delete CATEGORY word into categories link and show posts imediately when click on categories for example these links: [login to view URL] [login to view URL] [login to view URL] [login to view URL] [login to view URL] [login to view URL] [login to view URL] [login to view URL] [login to view URL] [login to view URL] [login to view URL] [login to view URL] [login to view URL] [login to view URL] [login to view URL] [login to view URL] must became: [login to view URL] [login to view URL] [login to view URL] [login to view URL] [login to view URL] [login to view URL] [login to view URL] [login to view URL] [login to view URL] [login to view URL] [login to view URL] [login to view URL] [login to view URL] [login to view URL] [login to view URL] [login to view URL] 2) I need also when I go to categories links, to see imediately posts, for example here now I see these: [login to view URL] [login to view URL] [login to view URL] [login to view URL] and I want insted see these: [login to view URL] [login to view URL] [login to view URL] [login to view URL] mantaining my original PERMALINK-URL FRIENDLY system