Specifying browser messages
You can specify what messages appear in the browser. In Photoshop, use the Message Text and Alt Tag areas of the Slice Options dialog box. (See To display the Slice Options dialog box (Photoshop):.) In ImageReady, use the Status Bar Message and Alt options of the Slice palette. (If the Message and Alt options aren't showing in ImageReady, choose Show Options from the Slice palette menu, or click the Show Options button 
on the palette tab.)
These options are only available for Image slices, and only appear in exported HTML files.
Message Text/Status Bar Message
Lets you change the default message in the browser's status area for a selected slice or slices. By default, the slice's link URL, if any, is displayed.
Alt Tag/Alt
Lets you specify an Alt tag for a selected slice or slices. The Alt text appears in place of the slice image in nongraphical browsers. It also appears in place of the image while the image is downloading and as a tool tip in some browsers. Specifying Alt tags is a critical aspect of ensuring the accessibility of your page for visitors whose browsers do not display images.
To specify a browser message:
- Select a slice. If you are working in Photoshop, double-click the slice with the Slice Select tool to display the Slice Options dialog box.
- In the Slice Options dialog box (Photoshop) or the Slice palette (ImageReady), type the desired text in the Message text box, Alt text box, or both.