jquery向下滑动 - 默认情况下第一次隐藏表单 -

<div><input type="button" id="changePwd" value="Change your password"/></div>
<br/>
<div id="form_pwd">          
    <form method="POST" action="google.com" id="pwdChange">
        <table>
            <tr>
                <td width="175px"><label for="oldPwd">Enter your password</label></td>                
                <td><input type="password" name="newPwd" id="newPwd" size="35"/></td>
            </tr>
            <tr>
                <td><label for="oldPwd_>"Re-enter your password</label></td>
                <td><input type="password" name="newPwd_" id="newPwd_" size="35"/></td>
            </tr>
    <tr>
        <td></td><td><input type="submit" value="Save Password" /></td>
    </tr>
        </table><br/>

    </form>
</div>

<script>
$("#changePwd" ).click(function () 
{
    if ($("#form_pwd").is(":show")) 
    {
    $("#form_pwd").slideDown("normal");
    }
    else
    {
    $("#form_pwd").hide();
    }
});

</script>
<div><input type="button" id="changePwd" value=