Please Help! Can not use mouse to click on anything!!!

Hi all. i know most people ignore people like me but i need help.

Today i was messing around in system preferences. i was in expose and spaces. I went to choose which shortcut i wanted to use to enable expose. for some reason i had the option of choosing which mouse button to use, there was a list continuing up to 300 of "mouse button 1, mouse button 2, 3, 4, 5... and so on. i wondered what it would do and i pressed on it. i discovered that this button made a setting so every time i click on the mouse, primary or secondary, it opens expose and i cant get it away!!!! ive tried heaps like boot into safe mode delete some files.
i can use the keyboard to open aplications. i can get to the expose settings but i dont know how i can change the settings just using the keyboard. Luckily i have a guest account which i used to create an admin account (root). i can ssh the mac while logged into my user and open command prompt. i also have file sharing on.
Does anyone know how to help me??

 

ive had a mac for ages.

i know a lot about mac. ive always known what im doing. This was a glitch

 

dont work. clicking in screen saver does this too.