Disable AutoSave in Wp 3.0

Hi,

I used to have a function in my functions.php that disabled AutoSave prior to WP 3.0. Here’s the code:

function disableAutoSave(){
wp_deregister_script('autosave');
}
add_action( 'wp_print_scripts', 'disableAutoSave' );

However, in WP 3.0 it doesn’t work!

Any suggestions on how to fix this?

Thanks!