Which begs the question...if your sighted users are so interested in the
text, why is it in an "alt" attribute? Why not make it a caption of the
image?

Also, alt text does not pop up in many browsers...mainly only recent
versions of IE for Windows. Not Mac, not most versions of
Netscape/Mozilla, etc. So if it's that interesting and important, you
might want to think about making the text an integral part of the page.

Just my $0.02.

John Gardner wrote:
> As a screen reader user I do not like long Alt tags.  Alt tags appear
> in-line and have to be read through whether you want to or not.  Often,
> especially when skimming, you simply do not want details about what a
> diagram is.  It is a much better practice to use D links in such
> cases.  These are links to long descriptions that any user can pop up for a
> description.  Although HTML supports a longdesc tag that is supposed to do
> the same thing, it is not currently supported by mainstream browsers.