I want to make a horse whistle npc that only drops one horse, and how do i set the speed of the horse?

And How do i make something that only lets a certain guild in, its something like if (strequals(#g,guildname))
If u know how, please reply!

if(weaponfired){
puthorse ridegold.gif,x,y;
destroy;
}

You can't, horses[index].bushes is read-only

if(playertouchsme){
if(strequals(#g,LAT)) hidelocal;
else say2 You can't go in!;
}

Thank You, i had the horse whistle script though. Thanks Anyways :)