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For most sites design for 800x600 with a dynamic layout. If your traffic consists of Web/MSNTV subscribers then you should design for 512x384 though I've only ever seen 1 out of tens of thousands use that service.
John
If your intended audience is the web in general then your width is 100% viewable, fluid to automatically scale to whatever the browser is currently using. Otherwise, choose a fixed width that will display in (egads! There are still some out there!) 640 by 480 to make sure you miss nobody. That's extreme, of course, the most common "low res" monitors are 800 by 600.
And like the other comments expressed, what are you trying to display, and why the 1200 spec?
what are you trying to display, and why the 1200 spec?
One the directory project that I am working, we are 'ahead' of schedule in designing part. So was thinking of 'maybe' setting up multiple layouts that users can choose from option menu within their profile.
The default layout is going to be for 800x600 settings which will be center aligned on the screen.