From TLKFAAwiki

Photoshop's Slice Tool--Never knew it was so useful.

This tutorial is, as the title indicated, for Photoshop 7.0. It shows how the slice tool can be used to make five identical-sized images at once; to simulate having a continous banner above your gallery links, instead of seperate toolbar icons.

The effect looks something like this:

The How-To bits:

Whichever way you want to do it, get your banner-type image looking the way you want it to look.

Your image should be a height of 120 pixels and a width of 600 pixels.

Now, select your slice tool from the toolbox. The icon should look something like this:

Make sure you have the 'Slice tool' and not the 'Select Slice tool' selected. Clicking and holding down on the icon should produce a small submenu to choose from, where you can make sure. Also, make sure 'Style'(near the top of the window) is set to Normal.

On your banner image, click and drag as you make a box across the image. Doesn't matter how big or small, just as long as you've got a box. Once you've got a box, let your mouse button go.

You want the 'Select Slice Tool' now, so go back to your knife tool icon, click and hold on it 'till the submenu comes up, and change the tool over.

Put your cursor in the middle of the box you made and double-click. A subwindow should come up.

In the fields that are labled H: and W: you want H:120 and W: 600.

Once that's done, hit OK. Your box might be off center, now; just use the slice select tool to click-drag it so that it outlines your origional image(this works best when the image window is maximized). You want the perimeter of your image and the perimeter of the slice you just made to match -exactly-, since they are now both the same size.

Then you're going to right-click in your now correct-size, correctly situated, box. Go to 'Divide Slice'.

When the subwindow asks you for specifics, you want to choose 'Divide Vertically' into 5 slices across, evenly spaced. And '120 pixels per slice'.

Hit OK.

Now 'Save for Web' under File (first menu on the top-left of the window). Make sure your settings in this subwindow are correct; what sort of filetype you want, ect., and hit 'Save'.

This format will save your five slices as five seperate images (and an HTML document with them all shown together), in their own new folder, wherever you chose to save them.. Ready to upload to the archive.

Enjoy.