This bookmarklet allows to navigate images in webpage using J and K keys.
jknav.src.js contains uncompressed bookmarklet code with some configurable options at the top
jknav.js is the main bookmarklet in compressed form
jknav-noanim.js is same bookmarklet, but without animation
Open bookmarklet (jknav.js or jknav-noanim.js), copy the code, then create new bookmark in your browser.
Paste copied code into the URL field, add bookmark name and you are set.
There are some options you can change:
// If false, scrolling to next/previous image will not be animated
var smooth_scroll = true;
// If true, always try to position image's top-left corner in browser's top-left corner
var horizontal_scroll = false;
// Duration (in ms) of scroll animation. Only used if smooth_scroll = true;
var duration = 100;
// Pause (in ms) between scroll animation frames. In this particular example animation
// will always be done in 10 steps (duration / interval)
var interval = 10;
// Minimal area (in square-px) of image for it to be included in navigation. By default
// image must be at least ~333x300 px in size
var area = 100000;
Continuous scrolling when J-K key is held down