[drupal-support] Locking comment subject to the node title

Drupal offers two options, both not really useful. The first is to let you always specify the subject of the comment, the second is to lock it to the first words in the comment.

What I'd like is to auto fill the subject field with "Re:" followed by the subject of the *node*. And then leave the user the possibility to type a new title entirely or leave it as it is.

For example, at line 1462 of the comment module: $form .= form_textfield(t('Subject'), 'subject', $edit['subject'] ? $edit['subject'] : variable_get('anonymous', 'Anonymous') , 60, 64);

This defaults the subject field to the anonymous name. I just need to know the exact code to replace that with the node title and add a "Re:" before it.

Can someone help me?

-HRose / Abalieno