X-Cart forums - skin Editing

Code:
<script type='text/javascript'><!--//<![CDATA[

   var m3_u =

(location.protocol=='https:'?'https://www.ls1.com.au/adserver/www/delivery/a

js.php':'http://www.ls1.com.au/adserver/www/delivery/ajs.php');

   var m3_r = Math.floor(Math.random()*99999999999);

   if (!document.MAX_used) document.MAX_used = ',';

   document.write ("<scr"+"ipt type='text/javascript' src='"+m3_u);

   document.write ("?what=zone:4");

   document.write ('&amp;cb=' + m3_r);

   if (document.MAX_used != ',') document.write ("&amp;exclude=" +

document.MAX_used);

   document.write ("&amp;loc=" + escape(window.location));

   if (document.referrer) document.write ("&amp;referer=" +

escape(document.referrer));

   if (document.context) document.write ("&context=" +

escape(document.context));

   if (document.mmm_fo) document.write ("&amp;mmm_fo=1");

   document.write ("'><\/scr"+"ipt>");

//]]>--></script><noscript><a

href='http://www.ls1.com.au/adserver/www/delivery/ck.php?n=aed66382&amp;cb=I

NSERT_RANDOM_NUMBER_HERE' target='_blank'><img

src='http://www.ls1.com.au/adserver/www/delivery/avw.php?what=zone:4&amp;cb=

INSERT_RANDOM_NUMBER_HERE&amp;n=aed66382' border='0' alt=''

/></a></noscript>
this is wat i have been asked to add to the skin of the store.

Where would this be done