Who Can Help Fix My Banner?

[2 FN LOW]

This is prob a simple fix for a coder...However i am not a coder...I designed a new banner that i am tryin to put on my forum...I would like the banner to flow all the way across the top of the screen..For example i would like it to look like it goes off the screen on both sides..To see an example of what i mean by going off the screen on the sides you can look at the banner on the forum below

http://www.6speedonline.com/forums/


this is the code in my header template

<!-- logo -->
<a name="top"></a>
<table border="0" width="$stylevar[outertablewidth]" cellpadding="0" cellspacing="0" align="center">
<td align="$stylevar[left]"><a href="$vboptions[forumhome].php$session[sessionurl_q]"><img src="$stylevar[titleimage]" border="0" alt="$vboptions[bbtitle]" /></a></td>
<td align="$stylevar[right]">
&nbsp;
</td>
</tr>
</table>
<!-- /logo -->

<!-- content table -->
$spacer_open

$_phpinclude_output

My banner is 1024px wide....Do i need to make it smaller? Regardless of that, i cant figure how how to get it to go to the end of the screen on both side...Any help here?

this is a link to my forum to see how it sits now
www.obsession2speed.com/forums

BTW let me just say that i am messing around with this as i go, so the image on my forum may change depending on when you click

UPDATE

I have gotten my banner to fit perfectly to the edges of my forum....However this isnt really what i was tryin to do...I was tryin to get it to flow off the screen as stated...I am using a smaller image at the moment to get it to fit like that...I have an image that is 1024px wide to use if i can get it off the edges of the screen.