FYI…

- http://www.us-cert.gov/cas/bulletins/SB04-329.html#zonelabs
Zone Labs Security Advisory, November 18, 2004
"A vulnerability exists which can be exploited by malicious people to cause a 'Denial of Service'. The vulnerability is caused due to an error in the Ad-Blocking feature (disabled by default) when processing JavaScript and can be exploited by tricking a user into visiting a malicious web site containing specially crafted JavaScript.

Update to version 5.5.062 or later via the "Check For Update" feature…"

:ph34r: