Dual Nav4/IE4 event handler

var nextKeys = new String("nN ")
var prevKeys = new String("pP")
function handleKeys(e) {
  var keyChar;
  if (is.nav4up) keyChar = 
     String.fromCharCode(e.which);
  else if (is.ie4up) keyChar = 
     String.fromCharCode 
     (window.event.keyCode);
  if (prevKeys.indexOf(keyChar) != -1)
  {  prev_slide(true); return false  }
  else if(nextKeys.indexOf(keyChar) != -1)
  {  next_slide(true); return false  }
  else return true;
}

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