lenny, iceweasel = firefox, flash, i386 (amd64:no;)

---

/etc/apt/sources.list
deb http://debian.torredehanoi.org/debian lenny main contrib non-free

---

aptitude install iceweasel

---

/etc/apt/sources.list
...
deb http://www.backports.org/debian etch-backports main contrib non-free

---

#aptitude -t etch-backports install flushplugin-nonfree

---