var addrbookSession = Components.classes["@mozilla.org/addressbook/services/session;1"].getService().QueryInterface(Components.interfaces.nsIAddrBookSession);
// add a listener, so we can switch directories if
// the current directory is deleted
var addrbookSession = Components.classes["@mozilla.org/addressbook/services/session;1"].getService().QueryInterface(Components.interfaces.nsIAddrBookSession);
// this listener only cares when a directory is removed