app.js

  this.load = function(callback, act) {
    if(act || __images.length === 0) callback.call();

    var cover = document.createElement('div'),
      counter = 0;

    cover.id = 'cover';
    cover.style.width = wwh()[0]+'px';
    cover.style.height = wwh()[1]+'px';
    cover.innerHTML = ' \
      <span>Загружено изображений:</span> \
      <span id="load_percent">0%</span>';
    $('body').appendChild(cover);

    var load_percent = $('#load_percent');

    images = new Object();

    for (var i = 0; i < __images.length; i++) {
      var key = __images[i].split('/').last();
      images[key] = new Image();

      images[key].onload = function() {
        counter ++;

        if(counter % 3 === 0) {
          load_percent.innerHTML = (parseFloat((counter/__images.length).toFixed(2)) * 100).toFixed() + '%';
          console.log(new Date().getMilliseconds());
        }

        if(counter === __images.length - 1) {
          //$('body').removeChild(cover);
          callback.call();
        }
      }

      images[key].src = __images[i];
    }
  };

this approach sucks