IE8 middle click behavior:<br>
Google open up in new tab<p>

Firefox 3.5.3 behavior:<br>
Google opens up in new tab<p>

Chrome 4.223.0.223.9 behavior:<br>
Yahoo replaces current page<br>
Google opens up in new tab<p>

<table>
<tr>
    <td onclick="window.location.href='http://www.yahoo.com'" width="100%" height="50"><a href="http://www.google.com/" >middle click me</a><br></td>
</tr>
</table>