The current versioncheck does not validate as XHTML 1.0, errors as follows:
the img tags are not closed, styles and forms are not allowed in table elements, and there are repeated class attributes for certain td elements (tablegreen and green)
There is also an error in the file versions:
versioncheck.php is listed locally as 1.29, but the version on record is 1.26
include/picmgmt.inc.php is listed locally as 1.19, but the version on record is 1.20
I also do not feel that following files should not be listed as mandatory, as they are not, and the installation is safer with them removed:
include/config.inc.php.sample
install.php
update.php
upgrade-1.0-to-1.2.php
just fyi