$(document).ready(function() {
  var reverseLogo = function() {
    $("h1 img").attr('src', '/images/avec/avec-logo-reversed.png');
  }
  
  var setOriginalLogo = function() {
    $("h1 img").attr('src', '/images/avec/avec-logo.png');
  }
  
  $(document).bind("gallery:entered", reverseLogo);
  $(document).bind("gallery:exited", setOriginalLogo);
});