视屏无法引入为什么，firefox浏览器
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>新建网页</title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta name="description" content="布尔教育 http://www.itbool.com" />
<link href="css/main.css" rel="stylesheet" type="text/css" />
<script src="js/setHomeSetFav.js" type="text/javascript"></script>
<script src="js/myfocus-2.0.1.min.js" type="text/javascript"></script>
<script src="js/mf-pattern/mF_YSlider.js" type="text/javascript"></script>
<link rel="stylesheet" href="js/mf-pattern/mF_YSlider.css" type="text/css" />
<script type="text/javascript">
myFocus.set({
id:'Box'
})
</script>
</head>
<body>
<div>
<div>
<ul>
<li><a href="#">联系我们</a></li>
<li><a href="#" onclick="AddFavorite(window.location, document.title)">加入收藏</a></li>
<li><a href="#" onclick="SetHome(window.location)">设为首页</a></li>
</ul>
</div>
</div><!--top结束-->
<div>
<div>
<div>
<img src="image/logo.jpg" alt="慕课网" />
</div>
<div>
<img src="image/tel.jpg" alt="服务热线" /><span>24小时服务热线：183-2611-7861</span>
</div>
</div><!--logo结束-->
<div>
<div></div>
<div>
<div>
<ul>
<li><a href="#">首页</a></li>
<li><a href="#">关于慕课</a></li>
<li><a href="#">新闻动态</a></li>
<li><a href="#">课程中心</a></li>
<li><a href="#">在线课程</a></li>
<li><a href="#">人才招聘</a></li>
</ul>
</div>
<div>
<form action="" method="post">
<input type="text" />
</form>
</div>
</div><!--nav_mid结束-->
<div></div>
</div><!--nav结束-->
<div id="Box">
<div><img src="image/loading.gif" alt="图片加载中" /></div>
<div>
<ul>
<li><img src="image/ad2.jpg" alt="" /></li>
<li><img src="image/ad3.jpg" alt="" /></li>
<li><img src="image/ad4.jpg" alt="" /></li>
</ul>
</div>
</div><!--ad结束-->
<div>
<div>
<div>
<h2>新闻中心</h2><span><a href="news.html">MORE>></a></span>
</div><!--title结束-->
<div>
<img src="image/news.jpg" alt="" /><h2><a href="news.html">520 慕女神喊你来表白</a></h2><p>活动时间：5月20日-5月25日<br />获奖公布时间：5月26日<br /><a href="news.html">Learn More>></a></p>
</div><!--pic_news结束-->
<div>
<ul>
<li><a href="news.html">翡翠梦魇一号H模式攻略</a><span>2014-06-01</span></li>
<li><a href="news.html">翡翠梦魇二号H模式攻略</a><span>2015-06-03</span></li>
<li><a href="news.html">翡翠梦魇三号H模式攻略</a><span>2017-03-29</span></li>
<li><a href="news.html">翡翠梦魇H萨维斯奶萨视角</a><span>2017-04-01</span></li>
</ul>
</div><!--news_list结束-->
</div><!--news结束-->
<div>
<div>
<h2>课程中心</h2><span><a href="news.html">More>></a></span>
</div><!--title结束-->
<div>
<img src="image/css.jpg" alt="" /><h2><a href="news.html">CSS圆角进化论</a></h2><p>CSS圆角的出现身高ioahsoghaoisdfhoaqw阿斯顿hiuahfui3123发生反对啊哈我热上大发我的对萨达瓦法大厦大范围饭发生的娃发文爱迪生对萨达瓦法额外的</p>
</div><!--course_pic结束-->
<div>
<ul>
<li>PHP开发</li>
<li>前端开发</li>
<li>JAVA开发</li>
<li>Android开发</li>
</ul>
</div><!--course_type结束-->
</div><!--course结束-->
<div>
<div>
<div><h2>媒体聚焦</h2><a href="">More>></a></div><!--title结束-->
<div>
<embed src="http://player.youku.com/player.php/Type/Folder/Fid/22426252/Ob/1/sid/XNzM4Njc1OTE2/v.swf" quality="high" width="220" height="140" allowScriptAccess="always" allowFullScreen="true" mode="transparent" type="application/x-shockwave-flash"></embed>
</div><!--video_content结束-->
</div><!--video结束-->
<div></div><!---->
</div><!--sidebar结束-->
</div><!--main结束-->
</div><!--wrap结束-->
</body>
</html>
视频那段代码直接优酷复制的，在Firefox浏览器无法显示视屏，那一块是空白页。求解哪里出了问题
