$(document).ready(function(){

      $("a.hover1").wrapInner(document.createElement("span"));
      $("a.hover1 span").css("opacity","0");
      $("a.hover1 span").hover(function () {
                      // animate opacity to full
                      $(this).stop().animate({
                                      opacity: 1
                                      }, "slow");
                      },
                      // on mouse out
                      function () {
                              // animate opacity to nill
                              $(this).stop().animate({
                                      opacity: 0
                              }, "slow");
              });
              });