表单验证求帮助 , 谢谢了 ~

 <div class="field-group">

div class='box_main'>

		<div id="register" class="register">

			<form id="form" action="post.php" method="post" onSubmit="return check();">

				<div id="form_submit" class="form_submit">

					<div class="fieldset">

							<label class="required title">姓名</label>

							<span class="control-group" id="name_input">

								<div class="input_add_long_background">

									<input class="register_input" type="text" id="name" name="name" maxLength="11" value="" onblur="__changeUserName('name');">

								</div>

							</span>

							<label class="tips">僅用於產品註冊和資料錄入</label>

						</div>