You can specify what messages appear
in the browser. These options are available only for Image
slices and appear only in exported HTML files.
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, type the desired text.
Message Text
Changes the default message in the browser’s status area
for a selected slice or slices. By default, the slice’s URL, if
any, is displayed.
Alt Tag/Alt
Specifies 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.