How can I increase the number of allowed values on an image field? I need to increase the allowed number of image uploads to 15. Is there anyway to do this in a module or other means without hacking core files as suggested here - http://drupal.org/node/680546#comment-4126378?

This is Drupal 7.

Thanks,
Tim
You could also change the cardinality setting of your field instance without doing a direct query. The key function would be field_update_instance() and here is an example of how to modify your field: http://sivaji.drupalgardens.com/how-programmatically-change-field-instance-properties