>After reading this article http://www.cnn.com/2006/WORLD/meast/08/03/iran.israel.ap/index.html (and one almost exactly worded in an Argentinean newspaper, but in Spanish) I have so many doubts about that

Here are some highlights from the Wikipedia article on Hezbollah:

http://en.wikipedia.org/wiki/Hezbollah

Hezbollah supports the destruction of the state of Israel[55][56][57] and has co-operated with other militant Islamic organizations such as Hamas in order to promote this goal. Hassan Nasrallah has spoken in favour of the intifada[58] and has stated that"Israel is an illegal usurper entity, which is based on falsehood, massacres, and illusions, and there is no chance for its survival."[59]

Speaking at a graduation ceremony in Haret Hreik, Nasrallah announced on October 22, 2002: "if they all gather in Israel, it will save us the trouble of going after them worldwide."[60][61] The New York Times qualifies this as "genocidal thinking"[62], whereas the New York Sun likens it to the 1992 Hezbollah statement, which vowed, "It is an open war until the elimination of Israel and until the death of the last Jew on earth."[63] Michael Rubin qualifies his [Nasrallah's] goal as genocide too, quoting Nasrallah ruling out "co-existence with" the Jews or "peace", as "they are a cancer which is liable to spread again at any moment."[64] The Age quotes him like so: "There is no solution to the conflict in this region except with the disappearance of Israel."[65]