The http://www.gis.mz.gov.pl/ website has been designed for MSIE only. When you enter that site with Mozilla an alert appears stating "You're not using Internet Explorer. Some parts of the site may be unaccessible". Mozilla is redirected to http://www.gis.mz.gov.pl/index_nn.html. This page looks weird, but doesn't differ from index_ie.html much. The menu works, but it'ss wrongly positioned. Webmaster's e-mail is firstname.lastname@example.org
Currently this page behaves the same in IE and Mozilla. The only problem is when you're using a non-standard resolution. The logo is displayed by a script that checks if you have 800x600 or 1024x768, but won't put the logo if you've got e.g. 1152x864. This is a problem for all browsers, and is not limited to Mozilla, so I'm resolving this bug as Fixed.