Any changes I make to the css file: ui.css dont make any affect in IE7 (IE9 in compatibility mode).
If you go to: website you will see that this loads perfectly in Firefox but the select and the small gaps appear different in IE.

IE6

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Many things supported by Firefox or chrome are not available in IE(even newer versions)
so you cant rely on it.
maybe you can just show a message prompting the user to get one of those browsers