在鼠标上方显示文本

所以我试着让背景图像消失,然后在div中出现一些带有链接的文本。我已经让图像消失在鼠标上,但我不能让文本显示。这是我目前掌握的情况。我对这东西有点陌生。

/* I'm have the image removed with the first line, then setting the link
   as hidden then trying to make it visible, but the link never shows */

$('#res').mouseover(function(){
  $(this).removeClass('resume');
  $('#reslink').css(visibility,visible);
});

HTML格式:

        <div id = "res" class = "floatleft squares resume"><a id = "reslin" class = "link" href="resume.php">link</a></div>
  <div id = "pro" class = "floatleft squares projects"><a id = "prolin" class = "link" href="projects.php"></a></div>
  <div id = "con" class = "floatleft squares contact"><a id = "conlin" class = "link" href="contact.php"></a></div>
  <div id = "abo" class = "floatleft squares about"><a id = "abolin" class = "link" href="about.php"></a></a></div>

a{
 display: block;
 background: grey;
 height: 100%;
 width: 100%; 
 visibility: hidden;
}