JS, the DOM and CSS

Hi -
i hope someone can help on this one - and i hope i'm in the correct palce
for it!

I'm trying to find out, via JS, the value of particular property
within a particular class, as defined in a style sheet;
e.g. i want to know the width of anything that has class "NavButton", (where
that
class has the width defined in a .css)

I've got as far as
mySheet = document.Sheets[0]

but when i try to access
(1)   RuleCount = document.Sheets[0].cssRules.length
or
(2)  FirstRule= document.Sheets[0].cssRules[0]
(and ultimately
(3)  NavWidth = document.Sheets[0].cssRules['NavButton'].width)

i come up with errors: "Not an object or is null".


I think i'm using the syntax from my JS book, and i want it to work in
IE6 and NS6; but cannot get further into the sheets array than
discovering that it has one element :

SheetCount = document.Sheets.length

succesfully returns 1!

Many thanks for any ideas -


h.

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