IMac does not detect correct resolution of 2nd monitor

I am attempting to use my 42" LG HDTV as a 2nd monitor for my iMac. The native resolution for the LG is 1920x1080 but the iMac only allows me to select up to 1600x1200. It seems to think that the LG is a smaller screen than the iMac as well and my images are stretched. The monitors are also disproportionate, for example, if I expand a window so that there is an inch of space on all 4 sides on my iMac it will overwhelm the screen of the larger monitor so that only about 2/3 of the window is visible. It's as if the iMac thinks that the LG is in 4:3 display mode.
I am using a mini-DVI to VGA adapter. How can I get full resolution from my 2nd monitor?

The (analog) VGA connection is limiting your resolution. Idealy a (digital) Mini-DVI to DVI adapter and a DVI cable should allow the full resolution in Extended Desktop Mode.

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