Weird green outline...

Hi all,
I'm using Flash Pro 8 and doing some video streaming help section. Initially I've done the streaming part helplist. This worked OK (ignore the message inside Tip sectionat the bottom of the page).

Then I thought I should add a preloader to this help list page. So, I went ahead and do this preloader. Preloader worked OK and I managed to get to the help list. When I clicked on any one of the item in the list, it brings me to the streaming video page. Fine. But here if you notice, there's a green outline appears. Check this snapshot. I notice that the dimension of the outline is the same as the dimension of the list box from the help list page. So, what's goin on here?

Thanks in advance.

This is the code that is doing the preloading.