Bootstrap 2 horizontal form

Bootstrap 2 form.html

<form class="form-horizontal" method="post">
	<div class="control-group">
		<label class="control-label" for="email_inp">Email</label>
		<div class="controls">
			<input id="email_inp" name="email" placeholder="Email" type="text">
			<span class="help-block">Please enter a valid email address.</span>
		</div>
	</div>
	<div class="form-actions">
		<button class="btn btn-primary" name="submit_btn" type="submit">Save changes</button>
	</div>
</div>