ขอปรึกษาปัญหา Auto Submit ครับ (คือ ทำการ login web แล้ว อยากให้มัน auto Login ระบบ chat ด้วยครับ)

<? session_start();?>
<? if($_SESSION["myusername"] && !$_SESSION["name"]){?>
<script language='javascript'>
document.chatbox.submit();
</script>
<? } ; ?>
<div id="chatContainer" align="justify" style="font:15px Calibri,Arial,sans-serif;color:#eee;clear:both;">
  <div id="chatTopBar" class="rounded"></div>
  <div id="chatLineHolder"></div>
  <div id="chatUsers" class="rounded"></div>
  <div id="chatBottomBar" class="rounded">
    <div class="tip"></div>
    <form id="loginForm" method="post" action="" name="chatbox">
      <input name="name" class="rounded" id="name" size="15" maxlength="16" value = "<? if ($_SESSION["myusername"])
		  echo $_SESSION["myusername"]?>"/>
      <input id="pw" name="pw" class="rounded" type="password" value = "<? if ($_SESSION["myusername"])
		  echo $_SESSION["mypassword2"]?>" />
      <input type="submit" class="blueButton" value="Login" />
    </form>
    <form id="submitForm" method="post" action="">
      <input id="chatText" name="chatText" class="rounded" maxlength="255" />
      <input type="submit" class="blueButton" value="Submit" />
    </form>
  </div>
</div>