Alt Text in Images not appearing in Firefox and Chrome

[Ibby]

Hello,

I've only recently published my fledgling website and it's nowhere near ready yet:

http://www.valuevisionglasses.co.uk

I'm having a problem displaying the alt text in Chrome and Firefox from the
following page:

http://www.valuevisionglasses.co.uk/marketstall.html

There's only the one image. It works fine in preview mode and live with IE8 but doesn't work in either preview mode or live with Chrome and Firefox.

Can anyone help with this one please? I presume I'm doing something right to get it to work in IE.

Regards

Ibby