Javascript: Prototype.js - keep a timer running and maintain scope

If you create a Class with the Prototype.js class system, and you want to keep a timer running (for animation or other purposes), use this function to maintain the proper "this" scope:

runTimer: function() {
    // execute your own code here

    // keep timer running
    setTimeout(function(t) { 
        t.runTimer(); 
    }, 1000/30, this);
}