chromeFade.jquery.js

(function ($) {
  $.fn.chromeFade = function (opts) {
    var defs      = { msTilFade : 2000, fadeSpeed : 500, fadeTo : 0.01 },
        sets      = $.extend({}, defs, opts),
        elems     = this,
        fadeFunc  = function () {
          elems.fadeTo(sets.fadeSpeed, sets.fadeTo);
        },
        fadeTimer = setTimeout(fadeFunc, sets.msTilFade);
    
    $(document).mousemove(function () {
        elems.fadeTo(100, 1.0);
        clearTimeout(fadeTimer);
        fadeTimer = setTimeout(fadeFunc, sets.msTilFade);
    });
  }

}(jQuery));

// example : http://jsbin.com/avedu3/5