[development] form with confirmation (sometimes)

I have a form to allow deleting some variables. If the deleted item is 'empty' it should be possible to delete it without any problem; but full items should have a 'confirmation' step before deleting them. I have read http://drupal.org/node/387674 and http://drupal.org/node/385640; but in my case I need to pass an array to the confirmation form, and I think it has to be an easier way to allow a "Are you sure you want to do this?". Any hint is welcome. -- *La vida és com una taronja, què esperes a exprimir-la? *Si creus que l'educació és cara, prova la ignorància. *La vida és com una moneda, la pots gastar en el que vulguis però només una vegada. *Abans d'imprimir aquest missatge, pensa en el medi ambient.