Tyler's wiki

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Bookmarklets are cool.  They're javascript in a bookmark form, and they look like this:
<code=javascript>
javascript:(function(){
	//code
})();
</code>

You can read or modify the current page by referring to ''document''.  Here's one that opens a new tab with all image links from a page:

<code=javascript>
javascript:(function(){
	/* This regex was adapted from the BrowseImages extension for Firefox. */
	var regex= new RegExp('(\\.jpg$|\\.jpg[&;])|(\\.gif$|\\.gif[&;])|(\\.png$|\\.png[&;])|(\\.jpeg$|\\.jpeg[&;])|(\\.bmp$|\\.bmp[&;])|(\\.svg$|\\.svg[&;])|(\\/full\\.php\\?.*ima?ge?=)|(\\/preview\\.php\\?.*ima?ge?=)|(\\/view\\.php\\?.*ima?ge?=)|(\\/view\\.php\\?.*pic=)|(\\/view\\.showImage\\.php)|(album_pic\\.php?pic_id=)|(\\dchan\\.org\\/.*\\/cb-nws\\/)|(\\dchan\\.org\\/.*src\\.cgi)|(attachment\\.php\\?attachmentid=\\d+&d=\\d+)', "i");
	var doc = "data:text/html,<html><head><title>Images of '"+document.title+"'</title></head>";
	doc += "<body style='text-align:center; font-family: Verdana, sans-serif; font-size:80%;'><H1>Images of <a href='"+document.URL+"'>"+document.title+"</a></h1>";
	seen = {};
	for(var i = 0; i < document.links.length; i++) {
		link = document.links[i].href;
		if (link.match(regex) && !seen[link]) {
			doc += "<img src='"+link+"'><br>\n";
			doc += "<a href='"+link+"'>"+link+"</a><p>";
			seen[link] = 1;
		}
	}
	doc += "</body></html>\n";
	open(doc);
})();
</code>

You can install a new bookmarklet from scratch by copying the code in question, creating a new bookmark, and pasting the content into the location field (Firefox will take care of newlines and other issues automatically).  You can give them out just by making a link (but you'll have to escape a bunch of stuff, and I never bothered with that).