class attribut to print link

How about adding a class attribute to allow css styling of the link?
I modified the module so I could add a background image, as follows:

function theme_print_link($node) {
  $attributes = array('class' => "printpage", 'title' => t('Display a printer friendly version of this page.'));
  $links = l(t('printer friendly version'), "node/$node->nid/print", $attributes);
  return $links;
}