roll20 layer changer script

Layer changer

on("chat:message", function(msg) {
  if(msg.type == "api" && msg.content.indexOf("!show") !== -1) {
      var charName = msg.content.replace("!show ", "");
      var charToken = findObjs({_type: "graphic", name: charName})[0];
      if(!charToken) {
       return;
      }
      if(charToken.get("layer") == "gm"){
          charToken.set("layer", object);
      } else {
          charToken.set("layer", gm);
      }
}});