js弹出DIV

<div class="portlet-body form" style="margin: 50px; display: none;" id="chooseFa">
<form id="frm" name="frm" action="${request.contextPath}/score" method="post" class="form-horizontal">
<div class="row-fluid">
<div class="span4 ">
<div class="control-group">
<div class="controls">
<label class="control-label"><i style="color:red;margin-right:5px;">*</i>请选择方案：</label>
<select id="fajhh" name="fajhh" class="m-wrap span12">
<option value="">---请选择---</option>
<c:forEach items="${tempTpye}" var="item" >
<option value="${item.fajhh}">${item.famc}</option>
</c:forEach>
</select>
</div>
</div>
</div>
</div>
<div style="margin-left: 100px;margin-top: 50px">
<button class="btn blue" type="submit" onclick="return check()"><i class="icon-ok-circle"></i> 提交</button>
</div>
</form>
</div>