$(function () {
  var homepage_projects = $('.homepage-projects');
  homepage_projects.hover(
    function (event) { $('.homepage-projects img').not(event.target).fadeTo('fast', 0.5); },
    function (event) { $('.homepage-projects img').css('opacity', 1.0); }
  );
  $('img', homepage_projects).hover(
    function (event) { $(event.target).fadeTo('fast', 1.0); },
    function (event) { $(event.target).css('opacity', 0.5); }
  );
});