SO fiddle

Test Fiddle mainly for SO Questions

by Nick Craver

HTML

<link rel="stylesheet" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.4/themes/overcast/jquery-ui.css">
<table style="width: 100%;">
            <tr>
                <td>
                  <a href="#" class="xx">one</a>
                </td>
                <td>

            </tr>
            <tr>
                <td>
                  <a href="#" class="xx">Two</a>
                </td>
                <td>

            </tr>
            <tr>
                <td>
                  <a href="#" class="xx">Three</a>
                </td>
                <td>

            </tr>
        </table>

CSS

td { padding: 5px; }
.xx {
    border: 5px solid green;
}

.yy
{
 border: 5px solid red;    
}

JavaScript

$("a.xx").click(function() {
  $(".yy").not(this).removeClass("yy");
  $(this).toggleClass("yy");
});