post.style.position = "absolute";
    var doc = document.documentElement;
    var linkCenter = link.left + (link.right - link.left) / 2;
    if (linkCenter < 0.6 * doc.clientWidth) {
        post.style.maxWidth = doc.clientWidth - linkCenter + "px";
        post.style.left = linkCenter + "px";
    } else {
        post.style.maxWidth = linkCenter + "px";
        post.style.left = linkCenter - post.scrollWidth + "px";
    }
    post.style.top = (doc.clientHeight - link.bottom >= post.scrollHeight)
        ? (doc.scrollTop + link.bottom - 4 + "px")
        : (doc.scrollTop + link.top - post.scrollHeight - 4 + "px");
    post.style.zIndex = 9999;