scripting error in IE

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Hello everybody! I work on extjs-based (v 3.4) website. At Firefox, Safari and Chrome it runs well. But when I try to use Internet Explorer 9 I always get strange error:

- SCRIPT87: Invalid argument.
ext-all.js, line 7 character 90121

[fay]

Use ext-all-debug.js to get a better idea of where the error is occuring.

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I used debug-version of extjs source and settled the problem. I used document.width and document.height properties, which don't work in IE or even Opera.