Apache failover for JBoss

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http://serverfault.com – I am running a JBoss web app (AS 6 Final) hosted on linux (Debian). I would like to implement a failover solution so that when JBoss is down, a static web page is served in its place. My current solution is to run Apache as a reverse proxy (described here), which allows me to serve .php files from apache and forward all other requests to JBoss. But I am not sure how make Apache step in when JBoss is down? Note. both apache and jboss will be running on the same box, this is (Application failover rather then server failover) to cover times when JBoss is re-deploying etc. So I am looking for th (HowTos)