Screen Spanning and external monitor

Hello,
This morning I experimented my iBook and screen spanning.
I got my resolution to 1280X1024, but- The mirrored image sat in the middle of the external screen..I don't know if this is my monitor that is doing this, or if it's some setting I can set on either the laptop or monitor.
Any ideas?
Thank you!

Did you use Screen Spanning Doctor?

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    #    Option     "MinY"          "15372"
    #    Option     "MaxY"          "1230"
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    #    Option     "MinY"          "3858"
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    #    FontPath   "/usr/lib/X11/fonts/misc/"
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    #    FontPath   "/usr/lib/X11/fonts/100dpi/"
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    # This loads the miscellaneous extensions module, and disables
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    # This loads the GLX module
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        Driver      "kbd"
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            Depth     16
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            Depth     24
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            Depth        4
            Modes        "1280x800"
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            Depth        8
            Modes        "1280x800"
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        SubSection "Display"
            Depth        15
            Modes        "1280x800"
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            Modes        "1280x800"
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    Peter
    ThinkPad W520 | ThinkCentre E73 SFF | IdeaPad K1 | IdeaPad Yoga 11s | Miix 2 10" | 3000 Y300
    Give kudos to reward people for their assistance | Mark thread solved if the solution works | Please do not send me an e-mail regarding technical questions | I am not an Lenovo employee
    =====================================
    Dolby ; IdeaPad Slate Tablet

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