need some dhtml help

[Sam]

I need to make the tab underline go away when clicked but can't figure
out how to do it. Any help would be greatly appreciated.

code:

  <style type="text/css">
    #tabs {
      width:auto;
      }
    #tabs td {
      float:left;
      padding:0 0 0 9px;
      }
    #tabs a {
      color:#333;
          border-bottom:1px solid;
      float:none;
          }
    #tabs a:hover {
      color:#333;
      }
 </style>
<script language="javascript">
        function toggle(targetId, targetTd) {
                target = document.all(targetId);
                target2 = document.all(targetTd);
                if (target.style.display == "none"){
                        target.style.display="";
                        target2.style="border-bottom:0px;";
                } else {
                        target.style.display="none";
                }
        }
</script>
<table width="100%" cellpadding="0" cellspacing="0" id="tabs" border="0">
<tr>
        <td id="tab1"><a href="javascript:toggle('tab1details', 
'tab1')">tab1</a></td>
        <td id="tab2"><a href="javascript:toggle('tab2details',
'nav_notes')">tab2</a></td>
</tr>
</table>
<span id="tab1details" style="display: none"> 
        <br /><br />Tab1 details
</span>
<span id="tab2details" style="display: none"> 
        <br /><br /> Tab2 details
</span>

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