<script>
  $(function() {
    $('img#9backlogo').hover(
      function(){ $('img#9frontlogo').attr('src', 'newURL'); },
      function(){ $('img#9frontlogo').attr('src', 'oldURL'); }
    );
    $('img#10backlogo').hover(
      function(){ $('img#10frontlogo').attr('src', 'newURL'); },
      function(){ $('img#10frontlogo').attr('src', 'oldURL'); }
    );
  });
</script>