code:

// ==UserScript==
// @name           EasyFlickrLink2
// @namespace      what
// @description    Makes it easy to link back to Flickr when posting images in forums.
// @include        [url]http://www.flickr.com/photos/*/*/*[/url]
// ==/UserScript==

if (document.getElementById("allsizes-photo") == undefined) {

var PhotoDiv = document.getElementById("photo-drag-proxy").nextSibling;

var PhotoElement = PhotoDiv.getElementsByTagName("img");

var PhotoURL = PhotoElement[0].src;

var MetaDiv = document.getElementById("share-menu-options");

LinkBoxDiv = document.createElement("li");
LinkBoxDiv.setAttribute('class','share-menu-options');

LinkBoxDiv.innerHTML = LinkBoxDiv.innerHTML + '<div class="share-menu-options-header"><span class="caret"></span> Grab the BB code</div>';
LinkBoxDiv.innerHTML = LinkBoxDiv.innerHTML + '<div class="share-menu-options-inner" id="bbcodepayload">';

LinkBoxDiv.innerHTML = LinkBoxDiv.innerHTML + '</div>';
LinkBoxDiv.innerHTML = LinkBoxDiv.innerHTML + '</li>';
MetaDiv.appendChild(LinkBoxDiv);

var MetaDiv = document.getElementById("bbcodepayload");
MetaDiv.innerHTML = "Link: <textarea class='embed-markup' rows=5 cols=\"35\">[url=" + window.location + "][img]" + PhotoURL + "[/img][/url]</textarea>";


} else {

var PhotoDiv = document.getElementById("allsizes-photo");

var PhotoElement = PhotoDiv.getElementsByTagName("img");

var PhotoURL = PhotoElement[0].src;

var SizesURL = String(window.location);

var urlcutstart = SizesURL.indexOf("/sizes/");

var PhotoPageURL = SizesURL.substring(0, urlcutstart + 1);

LinkBoxDiv = document.createElement("div");

LinkBoxDiv.innerHTML = "&nbsp;<p/>BBCode Link: <input type=\"text\" size=\"50\" value=\"[url=" + PhotoPageURL + "][img]" + PhotoURL + "[/img][/url]\">";

PhotoDiv.appendChild(LinkBoxDiv);

}/