Add space to showthread.php for ads?

[huskermax]

I have 4.1.3 and I would like to add a space to the right side of the showthread.php template so I can put in ads. See below for an example of the ad code. But how do I put in the space to move the threads over to the left so I have space on the right side to put this in? I have searched for this and must be doing it wrong. Keep's telling me I don't have enough words in search string. Website is www.huskermax.com/vbbs/

<!--- start of pbuhuskermax_ros_160x600_247RealMediaAdTag --->
<script LANGUAGE="JavaScript1.1">
OAS_rn = new String (Math.random());
OAS_rns = OAS_rn.substring (2, 11);
document.write('<scr'+'ipt LANGUAGE="JavaScript1.1" SRC="http://network.realmedia.com/RealMedia/ads/adstream_jx.ads/pbuhuskermax/ros/160x600/jx/ss/a/1'+OAS_rns+'@x10"></scr'+'ipt>');
</script>
<!--- end of pbuhuskermax_ros_160x600_247RealMediaAdTag --->