// preloader.js

window.addEvent("domready", function() {
  var partnerlogos = $$("#partners ul li a img");
  
  partnerlogos.addEvent("mouseover", function(event) {
    event.target.set({
      "src": event.target.get("src").replace("gray", "normal")
    });
  });
  
  partnerlogos.addEvent("mouseout", function(event) {
    event.target.set({
      "src": event.target.get("src").replace("normal", "gray")
    });
  });
});