Again.

// ==UserScript==
// @name        HnHForumFixes
// @namespace   rabeuf.bloc
// @description Does the shit cobaltjones asked for.
// @include     http://www.havenandhearth.com/forum/*
// @version     1.3.37b
// @grant   none
// ==/UserScript==

function blankifyLinks()
{
    var links = document.body.getElementsByTagName("a");
    var length = links.length;
    for (var i = 0; i < length; i++)
    {
        var thisLink = links[i];
        switch (thisLink.className)
        {
            case "postlink":
            case "topictitle":
                thisLink.target = "_blank";
                break;
            default:
                break;
        }
    }

    var imgs = document.body.getElementsByTagName("img");
    length = imgs.length;
    for (var i = 0; i < length; i++)
    {
        var thisImg = imgs[i];
        if (thisImg.title === "View the latest post")
        {
            thisImg.parentNode.target = "_blank";
        }
    }
}

function resizeImages()
{
    var imgs = document.body.getElementsByTagName("img");
    var length = imgs.length;
    for (var i = 0; i < length; i++)
    {
        var thisImg = imgs[i];
        if (thisImg.alt === "Image")
        {
            //thisImg.style.display = "block";
            thisImg.style.height = "auto";
            thisImg.style.width = "auto";
            var scaleFactor;
            if (screen.width === window.innerWidth)
            {
                scaleFactor = 1;
            }
            else
            {
                scaleFactor = .7;
            }
            thisImg.style.maxWidth = (thisImg.parentNode.clientWidth * scaleFactor).toString() + "px";
        }
    }
}

blankifyLinks();
resizeImages();
window.onresize = resizeImages;