Use Alt <alt> Tags!
To see an example of alt text, hover your mouse over an image--in a well-designed site words should appear describing the image. Alt tags were invented as service to the disabled so they could "see" what an image on the monitor looked like.
It's great news for SEO, too. As long as you don't stuff your images full of keywords, it's a good way to add targeted keywords to your page's content.
Spiders eat alt tags up because even though they can't read an image, they sure can read an alt tag.
A great example of an alt tag is a picture of a brown dog with spots, with your alt text reading: "brown dog with spots".
Alt tags serve the following functions in SEO and web design.
* Make sites accessible to the visually disabled.
*Describe images so that search engines and the disabled can see them.
*Add keywords to your pages without cluttering them up.
Use alt tags for every image on your web site, within reason.