Notice
This page show a previous version of the articleA bookmarklet is a relatively short piece of JavaScript code (of perhaps 100 to 2000 characters in length) that the browser runs on the current page. It begins with "javascript:" instead of "http://". Otherwise, you can treat it just like any standard bookmark. For instance, in Firefox, you can keep a bookmarklet together with your other bookmarks on the bookmark bar.
Whereas a user script is typically installed from a site such as http://userscripts.org, bookmarklets can be saved by whichever means you use to create a bookmark. Simply replace the "Location" or "URL" field by the bookmarklet string.
Tatoeba bookmarklets
The following bookmarklet (author: AlanF_US), which will operate on any Tatoeba page (i.e., a page beginning with the string "http://tatoeba.org"), will let you link two sentences by copying their IDs or URLs into fields. It is based on a bookmark by Zifre, but it has the following advantages: - It does not require you to be on a page that shows one of the sentences. In fact, you can be on any Tatoeba page, such as a sentence list. - It will accept not only a sentence number (e.g., "1000000"), but a full sentence URL (e.g., "http://tatoeba.org/eng/sentences/show/1000000"). Since right-clicking on a link to a sentence and choosing "Copy Link Location" (or its equivalent in your browser) will give you a full URL, this saves you work because you don't need to trim the leading part of the URL before submitting it.
See also
See the Wikipedia page on bookmarklets or this short introduction for more details on bookmarklets.