jquery 垂直居中浏览器

<script>

$(document).ready(function(){
 
w= $(".kf").width();

h=$(".kf").height();

r=w/2;
s=h/2;
 
$(".kf").css("margin","-"+s+" 0 0 -"+r+"");
//要是个参数的时候用“+参数+”
 
  })


</script>


<table  border="0" cellspacing="0" cellpadding="0" class="kf" >
  <tr>
    <td><a href="#"><span class="cod">A-001</span><span class="cod"><img src="images/1116528.png" /></a></span></td>
    <td><a href="#"><span class="cod">A-002</span><span class="cod"><img src="images/13842.png" /></a></span></td>
    <td><a href="#"><span class="cod">A-003</span><span class="cod"><img src="images/13842.png" /></a></span></td>
    <td><a href="#"><span class="cod">A-004</span><span class="cod"><img src="images/13842.png" /></a></span></td>
    <td><a href="#"><span class="cod">A-005</span><span class="cod"><img src="images/13842.png" /></a></span></td>
    <td><a href="#"><span class="cod">A-006</span><span class="cod"><img src="images/13842.png" /></a></span></td>
  </tr>
</table>