ecmascript:

function initialize()
{
   if ((waypoints.length - timeIntervals.length) == 1 )
   {
     set_textMessage(textMessage);
     set_timeIntervals(timeIntervals);
     set_waypoints(waypoints);
   }
   else
   {
     alwaysPrint('timeIntervals.length=' + timeIntervals.length + ' should be one less '
                + 'than waypoints.length=' + waypoints.length);
     alwaysPrint ('timeIntervals=' + timeIntervals);
     alwaysPrint ('waypoints    =' + waypoints);
   }
   if (visible) revealText = true;
   else           hideText = true;
   tracePrint ('visible = ' + visible);
}
function set_textMessage(text)
{
   textNode.string = text;
   tracePrint ('textNode.string = ' + textNode.string);
}
function set_waypoints(waypointsArray)
{
   interpolatorNode.keyValue = waypointsArray;
   tracePrint ('interpolatorNode.keyValue = ' + interpolatorNode.keyValue);
}
function set_timeIntervals(intervals)
{
   tracePrint ('set_timeIntervals(' + timeIntervals + ')');
   totalDuration = 0;
   for(i = 0; i < timeIntervals.length; i++)
   {
      totalDuration = totalDuration + timeIntervals[i];
   }
   tracePrint ('totalDuration = ' + totalDuration);
   timeSensorNode.cycleInterval = totalDuration;

   interpolatorNode.key[0] = 0.0;
   for (j = 0; j < timeIntervals.length; j++)
   {
      interpolatorNode.key[j+1] = interpolatorNode.key[j] + timeIntervals[j]/totalDuration;
      tracePrint ('interpolatorNode.key[j] = ' + interpolatorNode.key[j]);
   }
   tracePrint ('interpolatorNode.key = ' + interpolatorNode.key);
}
function set_visible (value, timestamp)
{
	visible = value;
	if (visible) revealText = true;
	else           hideText = true;
	tracePrint ('visible = ' + visible);
}
function set_startTime (value, timestamp)
{
	tracePrint ('set_startTime = ' + value);
	set_visible (true);  // ensure visible when activated
	initialize ();       // ensure all computations up to date
}
function tracePrint(value)
{
   if (traceEnabled) alwaysPrint(value);
}
function alwaysPrint(value)
{
      if (textMessage.length > 1)
	       Browser.println ('[FlyingText ' + textMessage + '] ' + value);
      else Browser.println ('[FlyingText] ' + value);
}