<div id="chatBox">$CHAT_BOX$</div>  
  <script type="text/javascript">  
  function reloadTimeC() {  
  $('#chatBox').load('/ #chatBox',function(data){  
  $('#reloadSec').html('<span style="color:green;padding-top:4px;">Обновлено</span>');  
  setTimeout("$('#reloadSec').html('')",1000);  
  });  
  };  
  setInterval(reloadTimeC,30000);  
  </script>

  Там где setInterval(reloadTimeC,30000); - интервал времени обновления чата.

<div style="text-align:left;background:#ffffff;border:1px solid #CCD3DA;padding:2px;">  

  <table width="100%" cellspacing="0" cellpadding="0"><tr><td align="left" valign="top"><div style="font:8pt"><a href="javascript:void('Apply to')" style="color:#000000;" onclick="parent.window.document.getElementById('mchatMsgF').focus();parent.window.document.getElementById('mchatMsgF').value+='[i]$NAME$[/i], ';return false;"><b>$NAME$</b></a></div></td>  
  <td width="85%" align="right" valign="top"><a href="javascript://" style="font:8pt">$TIME$</a></td></tr></table>  
  <div style="text-align:left;font-size:9pt;">$MESSAGE$</div></fieldset>  

  </div><div style="margin-top: 4px;"></div>

<table width="100%">  
  <tr>  
  <td align="left" valign="top">  
  <textarea name="mcmessage" id="mchatMsgF" title="Сообщение" onkeyup="countMessLength();" onfocus="countMessLength();"></textarea>  
  <div style="float:left;"><div id="chatb" href="$SMILES_URI$"><img src="http://s105.ucoz.net/sm/1/smile.gif"></div>  
  <div id="chatb" href="$RELOAD_URI$"><img src="http://miniblog.3dn.ru/mreload.png"></div>  
  <div id="chatb" href="$BBCODES_URI$"><img src="http://miniblog.3dn.ru/bcodes.png"></div>  
  <div id="chatb" href="$MSGCTRL_URI$"><img src="http://miniblog.3dn.ru/options.png"></div></div><div id="reloadSec" style="float:right;"></div>  
  $_SECURITY_CODE$  
  </td>  
  <td width="10%" align="right" valign="top">  
  <div id="buttonsubmit" onclick="$('#mchatBtn').click();">ОК</div>  
  </td>  
  </tr>  
  </table>  
  <style>  
  #mchatMsgF{padding:4px;margin-top:6px;border:1px solid #B5B8C8; background:#ffffff url(http://miniblog.3dn.ru/fimage/text-bg.gif) repeat-x 0 0;width:100%;height:42px;font-family:tahoma;font-size:12px;font-weight:bold;}  
  #buttonsubmit{background:#6386d0;border:1px solid #3358a5;padding:13px;margin-top:6px;font-size:12px;color:#FFF;font-weight:bold;cursor:pointer;}  
  #buttonsubmit:hover{background:#7e9fe4;border:1px solid #3358a5;padding:13px;margin-top:6px;font-size:12px;color:#FFF;font-weight:bold;cursor:pointer;text-decoration:underline;}  
  #buttonsubmit:active{background:#4f72bd;border:1px solid #3358a5;padding:13px;margin-top:6px;font-size:12px;color:#FFF;font-weight:bold;cursor:pointer;text-decoration:underline;}  
  #chatb{background:#FFF;border-left:1px solid #B5B8C8;border-right:1px solid #B5B8C8;border-bottom:1px solid #B5B8C8;padding:4px;font-size:12px;color:#FFF;font-weight:bold;cursor:pointer;text-decoration:underline;display:inline-block;}  
  </style>  
  <div style="display:none;"><input type="submit" style="width: 30px;" id="mchatBtn" class="mchat" value="OK"></div>  

  <?if($FLD_SECURE$)?>  
  <table border="0" cellpadding="1" cellspacing="1" width="100%">  
  <tr><td width="50%">$FLD_SECURE$</td><td align="right">$IMG_SECURE$</td></tr>  
  </table>  
  <?endif?>