There's the function setletters("nameoflettersimage");, not entirely sure if this is what Skyld meant.
If you want to alternate them according to what level you're in, they remain as what you set when entering a different level, so it's good to create a system to handle this upon entry, such as:
PHP Code:
//#CLIENTSIDE
function onCreated(){
this.letterlevels = {
{"inside_foxtunnel", "fox"},
{"quest_sewers", "sewer"},
{"quest_tomb", "tomb"},
{"quest_castle", "castlemine"},
{"inside_graalcastle", "castle"},
};
}
function onPlayerEnters(){
for(temp.i : this.letterlevels){
if(player.level.name.starts("classic_" @ temp.i[0])){
setletters("classic_gui_letters_" @ temp.i[1] @ ".png");
return;
}
}
setletters("letters.png");
}