My signature is too big

As you can see right now, my signature is big as fuck, taking over ~16% of my entire screen (yes, I calculated it). With the recent IPB 3 update, it's being automatically stretched, which is a big problem with large screens (I have a 1920x1200 one). I don't want to completely think of a new one though, so I wanted to know if there is any way of hindering IPB from stretching it or making it not look more important than my post (because I have that negative feeling everytime I see one of my own posts).

The code looks like this (yes I know, I'm horribly overusing the <table> tag here):

HTML:

<table border="3" rules="all" style="font-family:Trebuchet MS; background-image:url('http://bsv-lueneburg.de/svprg/daten/Selbi/Grey.png');" align="center" cellpadding="5">
 <tr>
  <td align="center" colspan="2">
   [B]<font size="3">Please excuse any bad English in this post.</font>[/B]
  </td>
 </tr>
 <tr>
  <td align="center" valign="top">
   [URL=http://www.speedtest.net][IMG]http://www.speedtest.net/result/1170999057.png[/IMG][/URL]
   <br>
   <font size="3">[i]Speedtests[/i], can you trust them any more?</font>
  </td>
  <td valign="top">
   <table border="0" width="100%" height="100%" rules="rows">
    <tr>
     <td valign="top">
      [CENTER][IMG]http://www.hapisan.com/invert.php?uname=Selbi">[/CENTER]
     </td>
    </tr>
    <tr>
     <td>
      <table border="0" height="70" width="100%">
       <tr>
        <td align="center" style="font-size:30pt" valign="middle">
         [B][URL=http://info.sonicretro.org/Sonic_ERaZor]Sonic [i]ERaZor[/i][/URL][/B]
         <br><br>
         <div valign="bottom" align="right"><font size="3">... The [B]Exploding[/B] Adventure</font></div>
        </td>
       </tr>
      </table>
     </td>
    </tr>
   </table>
  </td>
 </tr>
 <tr>
  <td colspan="2">
   [CENTER]In the sky the mighty Eagle doesn't care 'bout what's illegal<br>
   On its wings the rainbow's light flying to eternity[/B][/CENTER]
  </td>
 </tr>
</table>

 

width:auto did the job just fine, thank you!

And if you want to rewrite this signature with less table bullshit, go ahead. I'd be honored.