| I can show you how to read a cookie, but it won't help you get the password to your account. You have to log in with the correct password before it will show up in a cookie, and even then, it will be encrypted like scottgem said (like on this site...it looks like an MD5 hash. It would take several YEARS to decrypt a password from MD5).
Reading your cookies CAN be useful, however, to see what kinds of things pages are tracking on you, and help keep your personal information secure.
Just go to the page where you want to see your cookie, and type in the address bar:
javascript:alert(document.cookie);
You may or may not need the ; on the end, but type that in the address bar and hit enter, it shold show the contents of your cookie for that site. | 
...if i can read the cookies i wll be able to know the password that he changed
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