$('document').ready(function() {
  $('img#learn').hover(function() {
    $(this).attr("src","/assets/6/hover_06.jpg");
  }, function() {
    $(this).attr("src","/assets/4/learn.jpg");
  });
  $('img#share').hover(function() {
    $(this).attr("src","/assets/7/hover_08.jpg");
  }, function() {
    $(this).attr("src","/assets/3/share.jpg");
  });
  $('img#connect').hover(function() {
    $(this).attr("src","/assets/8/hover_10.jpg");
  }, function() {
    $(this).attr("src","/assets/2/connect.jpg");
  })
});