HTML Attribute for <IMG ...>
ALT ="text string"

ALT specifies text that should be displayed if the picture is not displayed.

This Code Makes This 
<IMG SRC="/graphics/prepare.gif" ALT="prepare it">
when the picture is not displayed, it looks like this:

prepare it

(This is not the picture itself, this is a picture of what the picture looks like when it's not downloaded.)

<IMG NAME="..."> >