A userscript for Greasemonkey to add Roman numerals to Facebook, intended for Latin users

Userscript to add Roman numerals to Facebook

// ==UserScript==
// @name        Roman numerals for Facebook
// @namespace   http://userscripts.org
// @description Convert numbers on Facebook to Roman numerals (for Latin language setting)
// @include     http*://*facebook.com/*
// @grant       none
// @version     1
// ==/UserScript==

// Tweaked from http://stackoverflow.com/questions/9083037/convert-a-number-into-a-roman-numeral-in-javascript
function toRoman(num) {
    if (num > 3999999) { return num; }
    var result = '',
        ref = ['M', 'CM', 'D', 'CD', 'C', 'XC', 'L', 'XL', 'X', 'IX', 'V', 'IV', 'I'],
        xis = [1000, 900, 500, 400, 100, 90, 50, 40, 10, 9, 5, 4, 1];

    if (num <= 3999999 && num >= 4000) {
        result = '<span style="text-decoration: overline;">'+toRoman(num.substr(0, num.length - 3))+'</span>';
        num = num.substr(num.length - 3);
    }

    for (var x = 0; x < ref.length; x++) {
        while (num >= xis[x]) { result = result + ref[x]; num = num - xis[x]; }
    }
    return result;
}

function fixRoman(num) {
    num = num.replace('.', '');
    return toRoman(num);
}

var numberRE = new RegExp('\\b[\\d.]+\\b', 'g');

// Based on code from http://userscripts.org/scripts/review/83753
function replaceByClass(className, obj) {
    if (obj.getElementsByClassName) {
        var nodes = obj.getElementsByClassName(className);
        for (i in nodes) {
            if (typeof(nodes[i].innerHTML) == "string") {
                nodes[i].innerHTML = nodes[i].innerHTML.replace(numberRE, fixRoman);
            }
        }
    }
}

function fixup(obj) {
    if (typeof(obj) == "object") {
        replaceByClass('fsm', obj);
        replaceByClass('item', obj);
        replaceByClass('timestamp', obj);
	    replaceByClass('commentContent', obj);
        replaceByClass('mobile_status', obj);
        replaceByClass('uiStreamMessage', obj);
        replaceByClass('GBThreadMessageRow_Body_Content', obj);
        replaceByClass('UIStory_Message', obj);
    }
}

function listener(event) {
    fixup(event.target);
}

fixup(document);
document.addEventListener("DOMNodeInserted", listener, true);
//document.addEventListener("DOMCharacterDataModified", listener, true);