var backWorld=null;
function procCmd(cmd)
{
   cmd=cmd.split(' ');
   if(cmd[0]=="selectlevel")
   {
      if(cmd[1])
      {
      backWorld = Level.getWorldName();
         if(cmd[2])
         {
            if(cmd[3])
            {
               ModPE.selectLevel(cmd[1]+" "+cmd[2]+" "+cmd[3]);
            }else
            {
               ModPE.selectLevel(cmd[1]+" "+cmd[2]);
            }
         }else
         {
            ModPE.selectLevel(cmd[1]);
         }
      }else
      {
         clientMessage("Please define the world name.");
      }
   }else
   if(cmd[0]=="back")
   {
      if(backWorld===null)
      {
         clientMessage("You haven't teleported to a different world yet!");
      }else
      {
         ModPE.selectLevel(backWorld);
      }
   }
}