diary_block_crap.user.js

// ==UserScript==
// @match        http://*.diary.ru/*
// @run-at       document-start
// ==/UserScript==

var linksWithCrappyTag = document.getElementsByTagName("a");
for (var ix in linksWithCrappyTag) {
    var link = linksWithCrappyTag[ix];
    if (!link || !link.href || link.href.substr(-7) != "2895465") {
        continue;
    }
    while (link) {
        if (link.className == "paragraph") {
            break;
        }
        link = link.parentNode;
    }
    link.style.display = "none";
    var showContentLink = document.createElement("div");
    showContentLink.className = "paragraph link-inserted";
    showContentLink.style.textDecoration = "underline";
    showContentLink.style.cursor = "pointer";
    showContentLink.appendChild(document.createTextNode("Achtung, crap inside! Click here to show it."));
    showContentLink.onclick = function() {
        var chNodes = this.parentNode.childNodes;
        for (var chIx in chNodes) {
            var chNode = chNodes[chIx];
            if (!chNode) {
                continue;
            }
            if (chNode.className == "paragraph") {
                chNode.style.display = "block";
            } else if (chNode.className == "paragraph link-inserted") {
                chNode.style.display = "none";
            }
        }
    };
    link.parentNode.insertBefore(showContentLink, link);
}