Sooz, you need to supply the full URL with the http:// bit. e.g. http://www.angelfire.com/folk/gainsboroughfolk.

BTW, the "automatic gismo" doesn't add the Mudcat address. Links given without the http:// bit are relative links and are useful for addresses in the same site, e.g. to point to this thread, you could just give the "gismo" /thread.cfm?threadid=59154.