如何设定一段JS菜单显示不受浏览器限制？

Question

各位高手好！  本人做网站时，下载了一段JS动态菜单的代码，略修改后可以使用，但这段代码仅限于IE6 浏览器。不知能不能在其中设定不受浏览器限制，任何浏览器（最起码常用的浏览器）上都可以正常显示呢？万分感激！！！

Answer 1

高手们，因为本人基本不懂JS,所以不知哪位有类似的代码？能否贴上来看看？我先把我用的JS代码贴上来，大家要是会改的帮忙改改也行。十分感谢！！！
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Answer 2

好长！！
先将你a.xxx这种访问方式换成 document.getElementById("a").xxx
另外时间和属性的添加也没考虑兼容问题。
其他的看不下去了，眼都花了

Answer 3

先谢谢小草！不过我真是不懂，我这是个独立的JS文件，没放在页面中，也要用document.getElementById("a").xxx  这种方式访问么？还有，具体的兼容性该怎么改呢？能给个范例么？十分感谢！！！