I was going to say, the links were broken when I first looked but it doesn't matter because you have it there. I didn't really need the entire script anyway.
Anyway, Annie, yea... I'm thinking it's impossible. Your script doesn't really apply to what I am talking about, but it is the same scenario. Something more like this:
MainMenu:
mes "[NPC]";
mes "Hello! How are you!" // Make this stuff disappear without 'next;' command used.
menu "Stuff",-,
"More Stuff",-;
// Do stuff...
goto MainMenu:
EDIT:
Yes exactly, what GmOcean has said. Oh well! I guess I should make a request thread?