$(function() {
$(".fade-out").css("opacity","1"); // opacity of button set to 100%
$(".fade-out").hover(function () { // onmouseover
$(this).stop().animate({ // set opacity to 50%
  opacity: 0.50
  }, "normal");
},

function () { // onmouseout
$(this).stop().animate({ // set opacity back to 100%
  opacity: 1.0
  }, "slow");
});
});