如何使用JS弹出DIV并使整个页面背景变暗

<!-- 遮罩层 -->
<p id="cover" style="background: #000; position: absolute; left: 0px; top: 0px; width: 100%; filter: alpha(opacity=30); opacity: 0.3; display: none; z-index: 2 ">
  
</p>
<!-- 弹窗 -->
<p id="showp" style="width: 80%; margin: 0 auto; height: 9.5rem; border: 1px solid #999; display: none; position: absolute; top: 40%; left: 10%; z-index: 3; background: #fff">
  <!-- 标题 -->
  <p style="background: #F8F7F7; width: 100%; height: 2rem; font-size: 0.65rem; line-height: 2rem; border: 1px solid #999; text-align: center;" >
    提示
  </p>
  <!-- 内容 -->
  <p style="text-indent: 50px; height: 4rem; font-size: 0.5rem; padding: 0.5rem; line-height: 1rem; ">
    js弹窗 js弹出p,并使整个页面背景变暗</p>
  <!-- 按钮 -->
  <p style="background: #418BCA; width: 80%; margin: 0 auto; height: 1.5rem; line-height: 1.5rem; text-align: center;color: #fff;margin-top: 1rem; -moz-border-radius: .128rem; -webkit-border-radius: .128rem; border-radius: .128rem;font-size: .59733rem;" onclick="closeWindow()">
    确 定
  </p>
</p>

<script type="text/javascript">
  // 弹窗
  function showWindow() {
    $('#showp').show();  //显示弹窗
    $('#cover').css('display','block'); //显示遮罩层
    $('#cover').css('height',document.body.clientHeight+'px'); //设置遮罩层的高度为当前页面高度
  }
  // 关闭弹窗
  function closeWindow() {
    $('#showp').hide();  //隐藏弹窗
    $('#cover').css('display','none');   //显示遮罩层
  }
</script>