up and down key not functioning in i-mode html simulator II

[laaptu]

Dear users ,i have following actionscriptcode

var navBtn:Object = new Object();
 navBtn.onKeyDown = function(success) 
 {  
  var code:Number = Key.getCode();  
 //if(code == 40)    
 if(code ==9)   
  {    
    //this works for both up and down keys    
  }  
}

What I have is a navigation menu with up and down keys.I have to use 40 for down key press and 38 for up key press.When I do this,it works fine in adobe device central .But it doesn't work on i-mode html simulator.And when I do code ==9 as shown the up and down key works but it works for both up and down keys.
So what should I do to make up and down keys work on i-mode html simulator II .All your help will be greatly appreciated
Thanks in advance