page not displaying correctly in Mozilla 1.3

Hello

My page layout looks as I intend them to in IE6, Opera
5 and Mozilla 1.2.

I've just installed Mozilla 1.3 and the grey bar near
the top of the page has disappeared, pushing the title
near to the top.   It looked fine in Mozilla 1.2 and
the pages all validate as does the CSS.

The CSS for the grey bar is:

#greybar {margin : 0 0 1em 0 ;
	height : 0.5em;
	color : #000000;
	background-color : #eeeeee;}

The pages themselves can be found at:

www.raworths.co.uk/test/index.html

Can anyone give me an idea of what's gone wrong and
how to fix it?

Thank you
Pendle

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