Web前端开发实战6：CSS实现导航菜单结合二级下拉式菜单的简单变换_html/css_WEB-ITnose
前面几篇博文都在讲导航菜单和二级下拉式菜单，其实有很多方法都可以实现的，具体的情况还要视情况而定。
在后面学习到jQuery框架之后，会有更丰富的动画效果，由于在学习Ajax和jQuery的初步阶段，对于很多的复杂的导
航菜单和二级下拉式菜单没法做，但是学习了CSS和JS还是能实现一些简单的变换的。这篇博文就来说说用CSS实现
导航菜单结合二级下拉式菜单的两个简单变换吧。
首先还是在前面博文的基础上加以实现，其实只用HTML和CSS还是可以做出不错的效果，但是相较于JS和
jQuery来说就有很大的差距了。这些问题在学习完JS和jQuery之后你就会深有感触。
一中英文切换导航菜单
制作原理：在二级下拉式菜单的基础上加以变换就可以实现，在鼠标悬浮在相应的菜单上，二级菜单出现在导航
菜单的下面，我们可以把英文的菜单当做是二级菜单，在显示的时候将其反向向上移动到导航菜单上，让多出的部分
隐藏即可实现。
浏览器的兼容性问题：我测试的浏览器是火狐，谷歌，2345浏览器，以及IE7和8。
代码：
<meta http-equiv="Content-Type" content="text/html; charset=gb2312"><title>瀵艰</title>
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