Help Please. Tools

Hi all. I am kind of new to CS4, so this could just be a very stupid question. This is in regards to my tools palete on the left hand side of screen with Brushes, Clone stamp etc..

I had selected my clone stamp and on the tool preset picker changed it to the pattern stamp tool. So now my question is i have no idea how to get my clone stamp tool back, its not in the presets to select again. This exact thing also happened with my History brush as i selected the artistic one.

Anyone able to let me know what ive done wrong? or not doing?
very much appreciated.
cheers

Move your mouse over the pattern stamp and hold down the left click button. Any tool that has that small triangle in the corner of the icon has other tools underneath.

Thanks..........

I do not remember where I got it, but I think Adobe.com you could go there and search for AllTools. It helps big time till your use to where all the tools are. FYI