In order get rid of certificate warnings, you should trust the [http://www.orca-st.com publisher of this site].
In order to do so, take the following steps (Internet Explorer, [http://www.mozilla.org/firefox other browsers] will ask you if you want to trust this site or not and not bother you further). 
 * Open the authority certificate [/info/ca.der Orca Software CA].
 * Choose "Install Certificate" in the dialog that opens.
 * Choose "Place all cert.." in the "Certificate Store" dialog and "Browse" for the folder "Trusted Root Certification Authorities".
 * Ignore security warnings about installing the certificate. You know what you're doing. You're just trying to visit this site without nag screens. It's OK, really.