e621 swimmer

// ==UserScript==
// @name             E621 Swimmer
// @description      Navigate e621's pools with arrow keys
// @include          http*://e621.net/post/show/*
// ==/UserScript==
window.onLoad = checkForPool();
function checkForPool()
{
    var tags = document.getElementsByTagName('h6');
    for (var i = 0; i < tags.length; ++i)
    {
        if (tags[i].innerHTML === 'Pool')
        {
            var parent = tags[i].parentNode;
            var innerTags = parent.getElementsByTagName('a');
            document.addEventListener('keydown', function (e)
            {
                if (e.keyCode === 37 && innerTags[0].innerHTML == "&lt;&lt;")
                {
                    window.location=innerTags[0].href;
                }
                else if (e.keyCode === 39 && innerTags[innerTags.length - 1].innerHTML == "&gt;&gt;")
                {
                    window.location=innerTags[innerTags.length - 1].href;
                }
            }, false);
            break;
        }
    }
}