Text replacement clicking on AS2

Hi, I’m trying to do something considered simple, but I do not know how to fix it, A long time I did not working with Flash and I forgot how to do it, i created buttons (Movie Clip), inside i created a button with the command “tellTarget”, when i click on them, they show the “target”, but how do I set the text will replace the previous text without overlap?
I attach a file so it be clearer to understand what I need.
buttons.zip (5.7 KB)