Help on Generator event

Hi everyone. Has anyone played with Generator scripts? I have no idea where to look for help: except for several tutorials on Tom Krcha's website I can't find any documentation.

What I'm trying to do is launch JSX code every time the document updates. The problem is that this JS counts as an event and I'm getting an infinite loop. For now I put a timer check but I guess that is an ugly solution, because I don't know what time would take operations on different machines. Does anyone know if there's a different event I can use?

Here's my main.jsx:

(function () {

   "use strict";

   var generator;

   var i = 0;

   var lastOnChangeRunDate = getTime();

   function getTime() { return (new Date()).getTime(); }

   function init(gen) {

      generator = gen;

      generator.addMenuItem("fp", "test pludsfdfdsin", true, false)

      generator.onPhotoshopEvent("imageChanged", trololo);

      }

      function trololo ( e) {

        if(getTime()-lastOnChangeRunDate<400) return;

        lastOnChangeRunDate = getTime();

        i++;

        var str = "doc = activeDocument; \

              tL= doc.layers[0]; \

                 tL.textItem.contents = "+i

        generator.evaluateJSXString(str);

        }

   exports.init = init;

}());