Someone

  case 2: // Change Class - Initial
                    content.append("Change Subclass:<br>");

                    final int baseClassId = player.getBaseClass();

                    if (player.getSubClasses().isEmpty())
                    {
                        content.append("You can't change sub classes when you don't have a sub class to begin with.<br>"
                            + "<a action=\"bypass -h npc_"
                            + getObjectId()
                            + "_Subclass 1\">Add subclass.</a>");
                    }
                    
                    else if (System.currentTimeMillis() - player.lastsubchange <= 10000)
                    {
                    	player.sendMessage("You must wait 10 seconds to change your subclass again.");
                    	return;
                    }