FIELDSET in IE versus Netscape

I have some HTML pages that were written for IE and now I am trying
to make them work with Netscape.

I am running into a problem whereby I can't get a FIELDSET to be
centered and have a width attirbute.
<DIV CLASS="center">
<FIELDSET STYLE="WIDTH: 40%">
   :
</FIELDSET>
<DIV>

"center" is defined correctly higher up.
This works fine for IE but the FIELDSET does not show up centered in 
Netscape (it is left justified). When I remove STYLE="WIDTH: 40%" from the
FIELDSET tag, the contents of the FIELDSET becomes centered but the
FIELDSET (obviously) takes up the screen.

Can anyone tell me how I can achieve a centered FIELDSET with a width
attribute? Thanks very much,
       Mary


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