Bootstrap3 多个模态对话框无法显示的解决方案

<div class="modal fade" id="mediaMsgDialog" tabindex="-1" role="dialog"  
 aria-labelledby="myModalLabel" aria-hidden="true" > 
 <div class="modal-dialog"> 
  <div class="modal-content"> 
   <div class="modal-header"> 
   <button type="button" class="close"  
    data-dismiss="modal" aria-hidden="true" onclick="window.parent.closeMask()"> 
     × 
   </button> 
   <h4 class="modal-title" id="myModalLabel"> 
    选择多媒体信息 
   </h4> 
   </div> 
   <div class="modal-body" id="dlgMediaBody" style="text-align:center"> 
   <img src="../images/89.gif"> 
   </div> 
   <div class="modal-footer"> 
   <button type="button" class="btn btn-default"  
    data-dismiss="modal" onclick="window.parent.closeMask()">关闭 
   </button> 
   <button type="button" class="btn btn-primary" onclick="mitText('#menuContent')"> 
    发布内容 
   </button> 
   </div> 
  </div><!-- /.modal-content --> 
</div>