[Mark Sir Link]

please stop using thiso throughout this script, you clearly have no idea what its intent and purpose is for. I am sure you are having all sorts of scoping issues by calling it since thiso probably refers to a null object or the player itself when you are doing that.

PHP Code:

//#CLIENTSIDE
function onCreated(){
  this.rights = {"Drag", "Boots", "Blocks"};
  this.selected = 0;
}

function GraalControl.onKeyDown(temp.keycode, temp.keystring, temp.scancode){
  switch(keycode){
    case 219: this.selected = (this.selected - 1 < 0 ? 0 : this.selected-1); break;
    case 220: this.selected = (this.selected + 1 >= this.rights.size() ? this.rights.size() -1 : this.selected+1); break;
    default: return;
  }
  player.chat = this.rights[this.selected];
} 


or

PHP Code:

//#CLIENTSIDE
function onCreated(){
  this.rights = {"Drag", "Boots", "Blocks"};
  this.selected = 0;
}

function GraalControl.onKeyDown(temp.keycode, temp.keystring, temp.scancode){
  switch(keycode){
    case 219: this.selected = (this.selected - 1) % this.rights.size(); break;
    case 220: this.selected = (this.selected + 1) % this.rights.size(); break;
    default: return;
  }
  player.chat = this.rights[this.selected];
}