GUI separator line

Hi all, I have an easy beginner question.
I’m making popup gui menu for my game.
It’s a pop up dragable window that has 2 buttons and one text area and 1 label. All element’s backgrounds are white texture. All I want is 2 separator horizontal line between label, textarea and buttons. Does anyone know how to accomplish this?

Any hint, help appreciated.
Thanks.

I found nice library http://wiki.unity3d.com/index.php?title=DrawLine.