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I'm not sure there is another method other than resizeTo() that will do the same thing for you. If there is, it probably won't be working on most browsers.
I have a feeling that you won't be able to get around this problem you are having, and if you can, it will probably be an ugly hack that will cause more problems for you in the end. Javascript will not allow you to resize something past the computers own boundaries as I'm sure you can think of reasons why. I wouldn't worry about it too much. :)