[ubuntu] newbie setting up radeon video card

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http://ubuntuforums.org – I had a spare machine running vista.I have removed vist and from CD installed ubuntu. It all works ok except for my dual screens. I want the dual screens so I can read instructions and try things on other screen I have a "radeon hd4650 1gb ddr2 v/d hdmi" video card am very confused regarding setting up the video card. Is there a radeon card setup site that is good for a newbie :D (Hardware)