bookmarklet.txt

javascript:(function(){var e="http://imgs.xkcd.com/comics/",t=document.getElementsByTagName("img"),n=t.length;while(n--){if(t[n].src.substring(0,e.length)===e){alert(t[n].title);return;}}})();

xkcd-title.js

/**
 * Run this on any http://xkcd.com/ comic page to pop up an alert with the comic title.
 * 
 * Code inspired by this article and bookmarklet:
 * http://www.blendedtechnologies.com/read-xkcd-on-the-iphone-finally/223
 * 
 * Also see this Hacker News posting: http://news.ycombinator.com/item?id=316621
 * 
 * In order to run it as a bookmarklet, the code needs to be prefixed with javascript:
 * You should probably also run it through something to remove comments and whitespace.
 */
(function() {
  var comics_url = 'http://imgs.xkcd.com/comics/';
  var imgs = document.getElementsByTagName('img');
  var i = imgs.length;
  
  while (i--) {
    if (imgs[i].src.substring(0, comics_url.length) === comics_url) {
      alert(imgs[i].title);
      return;
    }
  }
})();