Centering an Image in IE7

I've defined a class in my style sheet as below:

.fig
{
    display: block;
    margin-right: auto;
    margin-left: auto;
}

And then I assign the class to certain <img> tags:

    <p>
        <img src="images/Performance.jpg" class=fig />  
    </p>

For FireFox this centers the image fine, but it seems to have no effect in IE7. The image remains left-justified.  What more is needed for IE7?

Thanks
stevaAsked:
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David S.Commented:
It sounds like IE is in quirks mode. Make sure you use a doctype that triggers "standards mode".

http://dev.opera.com/articles/view/14-choosing-the-right-doctype-for-your/
http://www.dynamicsitesolutions.com/html/document-types/
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stevaAuthor Commented:
Thanks. My doctype was there but had an extra <! in front of it::

<!<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Strict//EN"
"http://www.w3.org/TR/html4/strict.dtd">

IE couldn't find a valid DTD then so reverted to quirk mode.  Removing the <! got the image to center in IE7.

Thanks.
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