Predictive text in Safari
recently, i have noticed that Safari on my mac now does the same thing it does on an IPhone, it changes words that it doesn't know to something else. It particularly hates peoples name, and unfortunately changes names for one of my best mates to something pretty disgusting. This is particularly annoying in Facebook chat.
How do i turn this feature off? I have searched all through Safari preferences and can't find a solution.
Macbook Pro 15'', Mac OS X (10.6.7)