anchor.diff:  	</div>
   	<div class="form-group">
   		<div class="col-sm-5">
  -			<input type="submit" class="btn btn-primary" />
  +			<input type="submit" class="btn btn-primary btnSubmit" />
   		</div>
   	</div>
   </form:form>
   
  +<script type="text/javascript">
  +	$(document).ready(function() {
  +		$(".btnSubmit").click(function(e) {
  +			if(! $("#name").val()) {
  +				e.preventDefault();
  +				$(".errorMsg").show();
  +			}
  +		});
  +	});
  +</script>
  +
   
   <jsp:include page="layout/footer.jsp" />
positive.code: 			</div>
  		</div>
  	</c:if>
  
  	<form:errors path="name" />
  	<div class="form-group">
  
negative.code: <%@ taglib uri="http://www.springframework.org/tags/form" prefix="form" %>
  
  <form:form cssClass="form-horizontal" commandName="chatroom">
  
  	<c:if test="${param.success}">
  		<div class="form-group">
  			<div class="col-sm-6">
  