WP-Pointer – change pointerWidth?

Hello,

I am trying to adjust the width of a wp-pointer.
http://jumping-duck.com/tutorial/wordpress-feature-pointers/
wp source:
http://phpxref.ftwr.co.uk/wordpress/nav.html?wp-includes/js/wp-pointer.dev.js.source.html

I tried to add the options into the js without success:

$('#id').pointer({
 options: {
            pointerWidth: '800',
        },
 content: '<?php echo $pointer_content; ?>',
[...]

Does anybody managed to change the default width of 320px?
Thanks for every tip.