Form表单内textarea背景图片设置

<form action="" method="post" id="MrJin" name="MrJin">
    <textarea name="MrJin" id="MrJin" cols="" rows=""></textarea>
    <input name="Submit" type="submit" value="Submit" />
</form>

#MrJin {
    display:block;
    width:350px;
    height:240px;
    background:url(bg.jpg) no-repeat 10px 30px fixed;
    border:1px solid #06f;
    padding:5px;
    }