My new Quad Core iMac Not Getting Along With LG External.

I just got a new Quad Core iMac. It's great, except for one this:
My LG Flatron W1953T insists on a 1360 x 768 resolution. Unfortunately, the Displays control panel does not offer that as an option. The closes is 1280 x 768, which means I have a stretched image, which does not work for reading or looking at photos. The LG does not allow me to change its resolution.
How do I get my way-cool new iMac to offer 1360 x 768 as an output?
Thanks!

What Adapter are you using, Mini DisplayPort to DVI or VGA?
Mini DisplayPort to DVI Adapter - Apple Store (U.S.)
Mini DisplayPort to VGA Adapter - Apple Store (U.S.)
Cause my LG Flatron 2253T using an Apple DVI adapter gets, well see for yourself....
Dennis

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