I think max number of people is 16? For me is hardly to believe that 16 is maximum of online people every time,never 17 or 18!?! Is there someone who has more names shown by this script?

Can someone edit this script to show more then 16 people?

I modified the script:

// ==UserScript==
// @name           Facebook Online Logger
// @namespace      FBOnline
// @include        http://*.facebook.com*
// @exclude        http://*.facebook.com/login.php*
// @exclude        http://en-gb.facebook.com/*
// @description     Log out of Facebook Chat and still see who is online.
// @author     http://userscripts.org/users/59449
// @version     3.3
// ==/UserScript==

// Modified version of
// http://userscripts.org/scripts/show/19450
// http://userscripts.org/scripts/show/23499

// Ad remover
window.addEventListener("load", function(e) {
  var elements = xpath("//div[contains(@class, 'ad_capsule')] | //div[contains(@class, 'social_ad')] | //div[@id='announce'] | //div[contains(@id, 'sponsor')] | //div[contains(@id, 'ssponsor')]");
  if (elements.snapshotLength > 0) {
    for (var i = 0; i < elements.snapshotLength; i++) {
      var thisElement = elements.snapshotItem(i);
      thisElement.parentNode.removeChild(thisElement);
    }
  }
}, false);
function xpath (query) {
  return document.evaluate(query, document, null, XPathResult.UNORDERED_NODE_SNAPSHOT_TYPE, null);
}

var onlineResult = new Array();   // AJKAIN
var onlineFromPage = 0;   // AJKAIN
init();
function init() {
  if (!document.body) { window.setTimeout(function(){init();}, 300); }
  if (window != window.top) return;  // Don't run in a frame
  if ($('loginform')) return; // Don't run if not logged in
  MenuCommands();
  if (GM_getValue('ShowPopUp', true)) { createChatMenu(); }
  facebookOnline();
}

function facebookOnline() {
  /*GM_xmlhttpRequest({
    method:"GET",
    url:"http://iphone.facebook.com/friends.php?v=online",
    headers:{"User-Agent":"Mozilla/5.0","Accept":"text/xml"},
    onload:function(response) {
      if((response.readyState == 4) && (response.status == 200))
        parseResults(response.responseText);
    }
  });   AJKAIN*/
  facebookOnline_page();   //AJKAIN

  window.setTimeout(facebookOnline, 60000); // Refresh every 60 seconds
}

function facebookOnline_page() {   //AJKAIN
  GM_xmlhttpRequest({
    method:"GET",
    url:"http://iphone.facebook.com/friends.php?v=online&s="+onlineFromPage,
    headers:{"User-Agent":"Mozilla/5.0","Accept":"text/xml"},
    onload:function(response) {
      if((response.readyState == 4) && (response.status == 200)) {
        var rt = response.responseText;
        if (rt.length != 0) {
          onlineResult = onlineResult.concat(process(rt));
          onlineFromPage+=16;
          facebookOnline_page();
        } else {
          parseResults(onlineResult);
        }
      }
    }
  });
}

function parseResults(temp) {
  //var rt = process(temp);   AJKAIN
  var rt = temp;   //AJKAIN

  var uLINK = "";
  var popText = "";
  
  var today = new Date();
  var h = today.getHours();
  if (h<10) h = "0"+h;  
  var m = today.getMinutes();
  if (m<10) m = "0"+m;
  var dd = today.getDate();
  var mm = today.getMonth()+1;
  var yy = today.getFullYear();
  var t = dd+"/"+mm+"/"+yy+" "+h+":"+m;

  var lastchecked = GM_getValue("lastupdated", t);
  
  for (var i=0; i<rt.length;i+=1) {
    var uID = getUID(rt[i]);
    var uNAME = getUName(rt[i]);
  
    var a = GM_getValue(uID,uNAME+","+t+","+t);
    var b = a.split(",");
    var c;
  
    if (lastchecked == b[2]) {
      c = b[1].split(" ");
      GM_setValue(uID,uNAME+","+b[1]+","+t);  //was online
    }
    else {
      c = t.split(" ");
      GM_setValue(uID,uNAME+","+t+","+t);  //now online
    }
    
    if (GM_getValue('ShowTime', true)) {
      uLINK = c[1] + ' <a href="http://www.facebook.com/profile.php?id='+uID+'">'+uNAME+'</a>'; 
    }
    else {
      uLINK = '<a href="http://www.facebook.com/profile.php?id='+uID+'">'+uNAME+'</a>';
    }
    
    popText += '<div id="fbmLINK">'+uLINK+'</div>'; // For popup menu - add hh:mm here
  }

  if (GM_getValue('ShowPopUp', true)) { updatePopUp(popText,rt.length); } // Popup menu in place of chat
  
  GM_setValue("lastupdated", t);
}

// Adds the online friends list on top of the Facebook Chat bar
function createChatMenu (){
  var onshow = GM_getValue('ShowHide', false);
  if (onshow != true && onshow != false) { 
    onshow = false;
    GM_setValue('ShowHide', onshow); 
  }

  GM_addStyle(
    '#fbmDIV { bottom:-1px !important; right:75px !important; min-width:170px; border:1px solid #b5b5b5; background:#e5e5e5; position:fixed !important; z-index:99999 !important; padding:0px; }'+
    '#fbmHEAD { color:black; font-size:11px; padding:5px 6px 5px 6px; height:14px; min-width: 112px; padding-left: 21px; background-image: url(http://static.ak.fbcdn.net/images/presence/buddy_list.gif); background-repeat: no-repeat; background-position: 4px 6px; white-space: nowrap;}'+
    '#fbmHEAD:hover { cursor:pointer; }'+
    '#fbmEXIT { color:#6D84B4; float:right; font-weight:bold; padding:5px 6px 5px 6px; vertical-align:top; }'+
    '#fbmEXIT:hover { cursor:pointer; color:#3B5998; }'+
    '#fbmBODY { background-color:white; border-bottom:1px solid #b5b5b5; }'+
    '#fbmLINK { padding:4px 8px 4px 8px; }'+
    '#fbmNUM { font-weight:bold; }'
  );
  if (!onshow) { GM_addStyle('#fbmBODY {display: none;}'); }

  // Create new friends menu
  var div = document.createElement('div');
  div.id = 'fbmDIV';
  div.innerHTML = '<div id="fbmBODY"><div id="fbmLINK">Loading...</div></div><div id="fbmEXIT" title="Close">x</div><div id="fbmHEAD">Online Friends (<span id="fbmNUM">0</span>)</div>';
  document.body.appendChild(div);

  // Listen for clicks on the x and make the list disappear and stop updating
  $('fbmEXIT').addEventListener('click', function() { 
    $('fbmDIV').style.display='none';
  }, false);
  // Listen for clicks on the header and hide/show the list of friends
  $('fbmHEAD').addEventListener('click', function() {
    if (onshow) { $('fbmBODY').style.display='none'; onshow = false; }
    else { $('fbmBODY').style.display='block'; onshow = true; }
    GM_setValue('ShowHide',onshow);
  }, false);
}

// Updates the online friend list on top of Facebook Chat
function updatePopUp (temp,num) {
  if (temp == "") { temp = '<div id="fbmLINK">No online friends.</div>'; }
  if ($('fbmNUM')) { $('fbmNUM').innerHTML = num; }
  //if ($('fbmBODY')) { $('fbmBODY').innerHTML = temp; }   AJKAIN
  if ($('fbmBODY')) { GM_addStyle('#fbmBODY {max-height:500px; overflow:auto;}'); $('fbmBODY').innerHTML = temp; }   //AJKAIN
}

function $(id) { return document.getElementById(id); }
function getUID(rawt) { return rawt.substring(0, rawt.indexOf('"')); }
function getUName(rawt) { return rawt.substring(rawt.indexOf('.jpg"></div>')+12, rawt.length); }

function process(response) {
  var result = new Array();
  var res = response;
  var i = 0;
  var indexd, indexu;
  
  while(res.indexOf('profile.php?id=') > 0) {
    res = res.substring(res.indexOf('profile.php?id=')+15, res.length);
    indexd = res.indexOf('<div class="listCaption2');
    indexu = res.indexOf('</u>');
    if ((indexd == -1) || (indexu < indexd)) { result[i] = res.substring(0, indexu); }
    else { result[i] = res.substring(0, indexd); }
    i++;
  }
  
  return result;
}

// User Script Commands in Greasemonkey
function MenuCommands (){
  GM_registerMenuCommand('FBOnline: Show/Hide PopUp Friends', function(){
    if ((GM_getValue('ShowPopUp', true)) && (confirm('Hide online friends in place of Facebook Chat?'))) {
      GM_setValue('ShowPopUp', false);
    }
    else if ((!GM_getValue('ShowPopUp', true)) && (confirm('Show online friends in place of Facebook Chat?'))) {
      GM_setValue('ShowPopUp', true);
    }
  });
  GM_registerMenuCommand('FBOnline: Show/Hide Time', function(){
    if ((GM_getValue('ShowTime', true)) && (confirm('Hide Time next to friend?'))) {
      GM_setValue('ShowTime', false);
    }
    else if ((!GM_getValue('ShowTime', true)) && (confirm('Show Time next to friend?'))) {
      GM_setValue('ShowTime', true);
    }
  });
}

great job man!! now it works perfectly!