// ==UserScript==
// @name             E621 Swimmer
// @description      Navigate e621's pools with arrow keys
// @include          http*://e621.net/post/show/*
// @grant            none
// ==/UserScript==

/*
 * Remove these comments if you want images to
 * automatically expand on load and the window
 * to scroll to the image.
 */
// window.location = '#image' //moves the screen to the image. kinda buggy if the banner disappears.
// var e = new Event('click');
// document.getElementById('highres').dispatchEvent(e); //loads the highres image

var tags = document.getElementsByTagName('a');

for(var i = 0; i < tags.length; ++i) {
    if(tags[i].innerText === '<< Previous') {
        var prev = tags[i].href;
    }
    else if(tags[i].innerText === "Next >>") {
        var next = tags[i].href;
        break
    }
}
document.addEventListener('keydown', function (e) {
    if (e.keyCode === 37 && prev != null && e.ctrlKey) {
        window.location = prev;
    }
    else if (e.keyCode === 39 && next != null && e.ctrlKey) {
        window.location = next;
    }
}, false);