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'null' is null or not an object error on javascript

I've successfully set up Chat (http://www.ebrueggeman.com/phpsimplechat/index.php)
On Firefox and Google Chrome it works fine without errors, but with MSIE6,7 it complains:
'null' is null or not an object error on javascript , about this function

function user_active_ajax(myvar) {
      var chatusers = document.getElementById('div_chat_users');
      var currentuser = document.getElementById('div_current_user');
      //JS Logic
      var messageArray = myvar.split(',');
      var resultHTML='';

      for (var i=0; i < messageArray.length; i++) {
            resultHTML = resultHTML      + (messageArray[i]+'<br/>')
      }
      chatusers.innerHTML = resultHTML; <------------------------------------ error line
}

from ajax/functions.js

Ideas?

ASKER CERTIFIED SOLUTION

mverschoof

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SOLUTION

priya_patil

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tomzu

ASKER

That partly solved my problem. Is anyone willing to help more?

This is example page of chat script http://www.ebrueggeman.com/phpsimplechat/examples.php

If I use MSIE, after I post a message, all messages dissapear. When you post again, they show up for some time (~2sec) then dissapear again.

tomzu

ASKER

Solved by myself :)

David S.

For anyone who finds this later, would you please tell us what the problem turned out to be and what your solution was?