[Plugin: Social Bookmarks] How can I change the width?

How can I change the default width from 100 to auto?
I have narrowed it down to this code in the sociallinks.php file.

$width = empty($options['width']) ? 100 : $options['width'];

If I change the code above from 100 to 500 then the default width if none is enter becomes 500 instead of 100.

I don’t know php very well so does anyone know how to edit the above code so that the default would be auto rather then an amount?

Thanks in advance for your help.