Technicalities: if you are having trouble viewing this site or sending orders it is probably due to having an older version of Internet Explorer or Netscape. We suggest you update your browser, click on the following links to download the latest version:

Internet Explorer for PC: www.microsoft.com/windows/ie/downloads/ie6/default.asp

Internet Explorer for Mac: www.microsoft.com/mac/download/ie/ie50.asp

Netscape Navigator for PC and Mac: www.netscape.com/download

Otherwise click here for another version of the website which has no frames and a basic ordering page (you have to do your own calculations!) - good luck!