You've got an extra double-quote mark and a semi-colon where they don't belong in your code. I think that's the only thing stopping it from working.
Following is some tested, working code to show you an example:
Code:
<table width="200" border="1">
<tr onclick="myframe.location.href='http://www.google.com/'">
<td> </td>
<td> </td>
<td> </td>
</tr>
<tr>
<td> </td>
<td> </td>
<td> </td>
</tr>
<tr>
<td> </td>
<td> </td>
<td> </td>
</tr>
</table>
<iframe name="myframe" src="http://www.yahoo.com/"></iframe>