To Change The Default Auto-Naming Convention - MACROMEDIA FIREWORKS 8-USING FIREWORKS Use Manual

Option
row/column (r3_c2,
r4_c7...)
Underscore
Period
Space
Hyphen
For example, if the document name is mydoc, the naming convention doc.name + "slice" +
Slice # (A,B,C...) results in a slice called mydocsliceA. Chances are that you will never require
a naming convention that uses all eight elements.
If a slice has more than one frame, by default Fireworks adds a number to each frame's file.
For example, if you enter the custom slice filename home for a three-state button, then
Fireworks names the Up state graphic home.gif, the Over state graphic home_f2.gif, and the
Down state graphic home_f3.gif. You can create your own naming convention for multiframe
slices using the HTML Setup dialog box.

To change the default auto-naming convention:

1.
Select File > HTML Setup to open the HTML Setup dialog box.
2.
Click the Document Specific tab.
3.
In the File Names section, create your new naming convention by selecting from the lists.
272 Chapter 11: Slices, Rollovers, and Hotspots
Description
Row (r##) and Col (c##) designate the rows and columns of the
table that web browsers use to reconstruct a sliced image. You can
use this information in the naming convention.
The element uses any of these characters typically as separators
between other elements.