var imgs = {
  "image_1" : "images/events_lg01.jpg",
  "image_2" : "images/events_lg02.jpg",
  "image_3" : "images/events_lg03.jpg",
  "image_4" : "images/events_lg04.jpg",
  "image_5" : "images/events_lg05.jpg",
  "image_6" : "images/events_lg06.jpg",
  "image_7" : "images/events_lg07.jpg"
};
Event.observe(window, "load", function() {
  preloadImages();
});