install_contact_add_category bug

Couple of issues with the install_contact_add_category function:

1. The call to db_next_id seems to be producing duplicate keys
2. The insert query uses an invalid syntax.

After editing the function I end up with:

function install_contact_add_category($category, $recipients, $reply = '', $weight = 0, $selected = 0) {
  db_query("INSERT INTO {contact} (category, recipients, reply, weight, selected) VALUES ('%s', '%s', '%s', %d, %d)", $category, $recipients, $reply, $weight, $selected);
}

Everything seems to work as expected that way. I am using mysql 5.