Resolution of built-in display with dvi adapter

I've connected my Imac to my Samsung DLP using a mini-dvi to s-video adapter. The display on the tv is fine, but the problem is that when ever the adapter is plugged in, I lose all widescreen resolutions for the built-in display. Does anyone know a way around this? If I used a mini-dvi to vga or hdmi adapter instead, would it do the same thing?
Thanks,
Julie

Then leave the adapter connected to the Mac for two reasons;
1. to prevent having to Detect and Adjust everytime it is connected.
2. to prevent ware and tare / damage to the Mac's Mini DVI port.
Mirroring will always cause the Mac's resolution to change, the system is using the best resolution to support both Mac and TV display's.
[Apple TV|http://store.apple.com/1-800-MY-APPLE/WebObjects/AppleStore.woa/wa/RSLID?nnm m=browse&mco=9509DA20&node=home/ipod/apple_tv] might be the best solution considering the TV is setup in a different room.

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Resolution of built-in display with dvi adapter

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