The problem with this is that the browser doesn't send you information about what the browser's size is. You would have to use javascript to do this. Here is a link to a test page that can show the various properties of the document and screen for the browser...
http://www.geekdork.com/samples/dhtm...ioningTest.htm
If you need to change what is actually rendered out you'll need to use javascript to check the browser properties and then relay them back to the server thru some hidden values and a postback.
Peter
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Work smarter, not harder.