Slice Tool

The Slice Tool cuts images to pieces for Web publications:

In the Toolbox, select the Slice Tool.
Drag a rectangle holding down the mouse button.
If necessary, move and resize the currently active slice. To move a slice by just a few pixels, use the keyboard cursor keys.
To create a slice with the pre-defined proportions choose the Fixed Aspect Ratio style and set Width and Height values.
To create a slice with pre-defined size choose Fixed Size style and fill the Width and Height input fields.
To add a slice just drag another rectangle.
Right-click on a slice to open the tool's context menu. Through this menu you can access the commands available in Photoshop.

Tip. The Slice tool is available in Photoshop Elements as well. You just need a tiny workaround.