It sounds like you are trying to preserve the original quicklaunch functionality where you could just keep clicking on the button to open more copies of explorer. Unfortunately, as far as I know there is no way to do that in 7, they have just completely re-vamped the taskbar.
However, if the only reason you want this is so that you can easily launch new copies of explorer, the same result can be achieved with ctrl+n, which opens a new window. Give it a try and see if it's something you can get used to.
Also, while unrelated, I would advise you that you should probably use a better browser, like firefox