It says that because the [/url] got included in the URL.
Flickr is NOT an acceptable image host; use Photobucket or ImageShack. Flickr won't work because the links don't actually go right to the pictures. They work like the pages here on the site, with URLs like http://www.psypokes.com/dex/psydex/039
. These are URLs that look nice and avoid extra things trailing off the end. However, the server forwards these to the real URL that looks much uglier; all sorts of ? and = and things at the end. The forums require a /image.ext sort of URL for the [img] tags to work. pic.jpg will work, but /pic will not.
latina mortua lingua est // ud mortua ud ea possit
prima meas ancestras necavit // et nunc me necat