A couple of questions. Are you installing qmailadmin as root? Are you trying to access qmailadmin through a virtual domain or the server's main domain settings?
I think for starters you will want to look at your install and figure out why qmailadmin didn't get installed under /htdocs/images/ Permissions problem maybe?
I do remember having this problem with qmailadmin and the images. The problem was we were trying to access it through a virtual domain. Our fix was that we created an alias in httpd.conf allowing the following:
I am using qmailadmin under a virtual site and it works just fine, images and everything.
My configure line is:
./configure --enable-htmldir=/usr/local/qmailadmin/html \ --enable-cgibindir=/usr/local/qmailadmin/cgi-bin \ --with-htmllibdir=/usr/local/qmailadmin
So /usr/local/qmailadmin/html is the root of the virtual site and ScriptAlias points to /usr/local/qmailadmin/cgi-bin. The images reside in /usr/local/qmailadmin/html/images/qmailadmin.
-- Aj. Systems Administrator / Developer