Blocking a Single IP from accessing the Internet

From:	"Sean Logan" <seanlogan at mailsnare dot net>
To:	<m0n0wall at lists dot m0n0 dot ch>
Subject:	Blocking a Single IP from accessing the Internet
Date:	Mon, 23 Jan 2006 15:17:54 -0800

I'm having problems trying to prevent an internal PC from using the internet
via port 80. I've tried

creating a rule but nothing has worked so far. Is there a specific order or
way I should create this rule?