Yes, there was a problem with newer version of IE with liferay 6.0.5. That's expected because IE9 wasn't released until after liferay 6.0.5 was released. I'm using liferay 6.1.0 GA1 and 6.1.1 GA2 and IE9 works fine. If you can't fix it yourself, maybe should should upgrade to newer version of liferay.
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