Use a text descriptor for a picture (known as alternative text or ALT text)
to aid those who have text-only browsers, have turned their graphics display
off, have slow speed connections to the Internet, or use voice readers.

Select the picture to which you want to add alternate text.
On the Format menu, click Picture.
Click the Web tab.
Under Alternative text, type text that describes the content of the picture.

This might also help in terms of search engine recognition.

DavidF