/*
Code by James Gregory 
http://www.metalmadness.co.uk/Blog/archive/2006/01/09/801.aspx
*/
PeriodicalExecuter.prototype.registerCallback = function()
{
    this.intervalID = setInterval(this.onTimerEvent.bind(this), this.frequency);
}

PeriodicalExecuter.prototype.stop = function()
{
    clearInterval(this.intervalID);
}