or you can just begin simple
first to make the door you will need to press alt+2 when the full wall is made then open it in paint or psp and cut out a section of that wall and make it a .gif or whatever format,
then make an npc with coding like
PHP Code:
if (playerenters) {show;}
if (playerchats&&strequals(#c,open)) {
hide;
dontblock;
sleep1;
show;
}
thats basicly kyle's script except very simple