how to insert a image into the captive portal web page?

From:	"Samenlia" <fhliang at 163 dot com>
To:	<m0n0wall at lists dot m0n0 dot ch>
Subject:	how to insert a image into the captive portal web page?
Date:	Tue, 18 May 2004 12:11:17 +0800

i upload a  portal web page and work ok

then i upload a web page with a image link 
and where i will put the image to ?

i try to put it in /var/etc/  not work!
i try to put it in /usr/local/www/  not work!

if anybody know ?