How does z1.adserver.com popup get past Spybot, AdAware, & Firefox?

octanicus_at_yahoo.com
Date: 05/15/05 

Date: 15 May 2005 11:04:52 -0700

How does z1.adserver.com get past the spyware blockers?

Pop-up ads virtually disappeared on my WinXP SP2 box by running
- Ad-Aware SE Personal build 1.05
- Microsoft AntiSpyware beta 1.0.501
- SpyBot Search & Destroy 1.3
- Spyware Blaster 3.2
- Sygate Personal Firewall 5.5
- Firefox 1.0.4 (set to block all popups with no exceptions)

Every program above set to block all popups possible with no
exceptions.
But z1.adserver.com still gets through somehow.

Does this pop-up use something tricky the antispyware folks can't catch?

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