Where to place banner exchange script in html

[Angelina]

I know it may sound stupid but still I cant seem to get a banner exchange script working on my website, its a code from a adult exchange network :

<!-- Adultexchanges.Net code begin -->
<center>
<script language="JavaScript">
document.write('<s'+'cript language="JavaScript" src="http://www.adultexchanges.net/exchange/work.php?n=1148&size=1&j=1&c=1&code='+new Date().getTime()+'"></s'+'cript>');
</script>
<NOSCRIPT>
<IFRAME SRC="http://www.adultexchanges.net/exchange/work.php?n=1148&size=1&c=1" width=468 height=60 marginwidth=0 marginheight=0 hspace=0 vspace=0 frameborder=0 scrolling="no"></IFRAME>
</NOSCRIPT>
<a href="http://www.adultexchanges.net">Adultexchanges.Net Adult Traffic banner exchange</a>
</center>
<!-- Adultexchanges.Net code end -->

I have absolutely no idea if i must put something before it or not, cause i ve pasted it into my html and it doesnt show anything on my website :

www.sexycam-live.com/startpage.html

If you guys could help me, I would really appreciate it.
Thanks in advance,

A