php无刷新登陆

<form action="login.php" method="post"  target="userlogin" name="loginform"> 
<div class="TxtUser" id="userlogindiv"> 
用户名：<input name="accounts" id="accounts" type="text"   size="18" > 
密码： <input name="passwords" id="passwords"  type="password"  size="18" > 
<input type="submit" name="Submit" value="登录" /> 
</div> 
</form> 
<iframe name="userlogin" width="1" height="1" ></iframe> 
//login.php页面: 
<?php
$accounts = $_POST[&#39;accounts&#39;];
$passwords = $_POST[&#39;passwords&#39;];
$showdata = "我登录啦!!";
if ($accounts == "admin" && $passwords == "123456") {
    echo &#39;<script language="JavaScript"> &#39;;
    echo &#39;parent.document.getElementById("userlogindiv").innerHTML=&#39;&#39;.$showdata.&#39;&#39;;&#39;;
    echo &#39;</script>&#39;;
}

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