As Markus mentioned, this is not a PHP problem, so I have moved it over to the HTML/CSS forum.
Please try to post your questions in the appropriate forum in the future.
To answer your question...
As far as I know, the CSS properties used to change the appearance of the scrollbar in IE are non-standard and work only in IE.
It has been a while since I last looked into this but I am pretty sure there is still no way for your CSS to affect the appearance of the scrollbar in any of the major browsers, except IE of course.
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