BL Post ID script

// ==UserScript==
// @name         BL Post Exposer
// @namespace    forums.nrvnqsr.com/
// @version      0.2
// @description  Make post numbers visible without having to do extra clicking
// @author       NMR-3
// @match        forums.nrvnqsr.com/*
// @grant        none
// @require      https://ajax.googleapis.com/ajax/libs/jquery/2.1.4/jquery.min.js
// ==/UserScript==

window.onload = function(){
    var userinfolist = document.getElementsByClassName('userinfo');
    for(var i = 0; i < userinfolist.length; i++){
        addPostIDForEach(userinfolist[i]);
    }
};

function addPostIDForEach(item){
    var postid = item.parentElement.parentElement.id;
    postid = postid.slice(5);

    var dt = document.createElement("dt");
    dt.innerHTML = "Post ID";
    var dd = document.createElement("dd");
    dd.innerHTML = postid;

    var sub = item.getElementsByTagName("dl")[0];
    if(sub != null && sub != undefined){
        sub.appendChild(dt);
        sub.appendChild(dd);
    }
    else {
        item.appendChild(dd);
    }
}