Using external monitor with 7"imac

in perusing this forum, to set up an external monitor, i only need a dvi adapter connected between the external monitor and the mini display port of the imac.
is that correct?
any suggestions on where to purchase the adapter?
once i have it connected, i believe i just need to go to system preferences and set it up via the display preferences.
thanks in advance.
mikeB.

i have a dell monitor also. 1901fp is the model number. it uses the dvi-d single link connector. i'm having problems finding a miniport to dvi-d single link connector. any suggestions?
or do i have to find an adapter to adapt the single link to dual link first?
i should have know this wasn't going to be easy!
thanks,

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