text: var stopkeyboardListener = false;
  document.onkeydown=function(e){
      var isIE = (document.all) ? true:false;
      var key;
      if(isIE){
          key = window.event.keyCode;
      }else{
          key = e.which;
      } 
      if(!stopkeyboardListener){
          if(key==37){
              move('left');
          }
          if(key==38){
              move('up');
          }
          if(key==39){
              move('right');
          }
          if(key==40){
              move('down');
          }
      }
  };
  function move(direction){
      ajax(direction);
  }
  