Company Name: Payne-Mason
ZenCart: v1.3.7

I have the following javascript code for some affiliate tracking and I'm having problems identifying where and what file I need to insert this into:

<!-- Payne-Mason Tag Begins Here -->

<script language='Javascript'>

document.write( '<scr'+'ipt language="Javascript" src="' );

if( document.location.toString().indexOf( 'https://' ) != -1 ){ document.write( 'https' ); } else { document.write( 'http' ); }

document.write( '://hits.affiliatetraction.com/cgi-bin/convert?js=1&offer=4656&amount=[DYNAMIC AMOUNT]&uid=[UNIQUE TRANSACTION ID]"><\/scr'+'ipt>' );

</script>

<noscript><img src='http://hits.affiliatetraction.com/cgi-bin/convert?offer=4656&amount=[DYNAMIC AMOUNT]&uid=[UNIQUE TRANSACTION ID]' border=0 width=1 height=1></noscript>

<!-- Payne-Mason Tag Ends Here -->

Any insight would be awesome... everywhere I've tried to insert it...it messes up the file/page I inserted it into...