Why does IE display images slightly larger than other browsers?

This may be nothing to do with CSS in which case I apologise for wasting your time.

I noticed that images on my website are about 5% larger when viewed in IE6, compared to Mozilla or Firefox, even if I embed "width = x pixels, height = y pixels" in the HTML. A friend pointed me at this URL as an explanation:

http://www.quirksmode.org/css/quirksmode.html

but this seemed to imply that explicitly defining the size in pixels should work. It also recommends using non strict mode for the site's CSS file which strikes me as unwise.

Lest this is specific to something silly my own site, here's the URL:

w-w-w-furfur.demon.co.uk/geop <slash> vgap4 - dot - htm

(please excuse the URL mangling but even after 2 levels of filtering, I still get 200 spams a day, the root cause seems to be that many years ago I posted my unmangled email / URL addresses on newsgroups and they were harvested.)

the image I find most frustrating is the one in the top left (saying "Klingon Kommand"). It's meant to be as wide as the navbar (202 pixels) but in IE, it expands. I use IE6.

A further puzzlement to me is that it looks OK if I look at it from work - where I also have IE6. Obviously I want the site to appearance to be independent of browser or obscure browser settings.

Thank you for your time,
--
Paul Honigmann
.

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