Photoshop cs2... How to undo..?

If you make a mistake on photoshop cs2, how do you undo it? I can't seem to find an undo button.. thanks!

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Photoshop cs2... How to undo..?anti virus software

The 'history' window is an excellent way for you to undo changes to an image. Every time you make a change to your image it is recorded in the history window. You can click on any change in the history window and the image will revert back to that state.

To view the history window, simply click on the 'Window' pull down option and you will see 'History' as the 10th option on the list.

Photoshop cs2... How to undo..?aurora

CTRL - Z to undo, and CTRL-SHIFT-Z to step backwards. Which is like undo, but better because you can go back multiple times, where as undo just covers your last mistake.
ctrl+z is the keyboard undo shortcut for photoshop! =]