<a class="goster" href="#">GÖSTER</a>
<a class="gizle" href="#">GİZLE</a>
<span>W3TR</span>

a{display: inline-block; background: #00FF99; padding:20px; border-bottom:4px solid #00CC00; color:#00CC99; text-decoration:none; margin-bottom:20px;}
span{display:block; font-size:30px; color:red; margin-bottom:20px;}

$(".goster").click(function(){
  $("span").hide();
});
$(".gizle").click(function(){
  $("span").show();
})