Mozilla CSS and Entities

I seem unable to view docbook documents in Mozilla (v1.5) using a CSS styleheet when the docbook XML contains character entities.

 

eg.

<para>hello &mdash; world</para>

 

throws a Mozilla error where as the same without the &mdash; works fine.

 

I understand older versions of Mozilla had problems with such things. Is this still the case? is there anything special I need to configure?

 

TIA

 

croaker

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