Despite choosing the correct options (i was using joomla comment in joomla 1.0), when moved to joomla 1.5 the URL icon doesn´t appears in comments.

When I look at the backend, it is there, but in frontend the URL input from the user doesn´t shows up.

You can see it here, for example: http://reinehr.org/sociedade/o-mundo-as-avessas/a-caminho-dos-99-9999995-carta-de-gilberto-geraldo-garbi-ao-presidente-lula

or in another post at http://reinehr.org

Have I missed something?