IE 7 z-index problems

I was having a bit of trouble on implementing a menu for a web application. Specifically, on IE 7 the applications menu floated beneath the rest of the elements on the page. I googled for the problem, but I couldn't find a comprehensive example to solve my problem. Finally, I found this post which is very helpful, explains why IE reacts the way it does and give a solution with examples. Good work...!