Debug and fix the z-index bug in IE6 and IE7
Internet Explorer 6 and 7 has a really really annoying bug that makes it really hard to use z-index. I won’t go into any specifics about exactly what is causing this and so on because others have already done that. I just want to tell you that I found this awesome jQuery script that injects z-index that IE6/IE7 can handle on the elements of a DOM tree. You can either just add this script and run it in production or you can use it to debug z-index problems in Internet Explorer.