Need to add code to checkout login page

Hi: here's the Page:

spiritinform.cloudaccess.net/index.php?o...=checkout&Itemid=379

I need to be able to add some code to this page for the omnistar affiliate program, but am unsure how to do that... any ideas?

many thanks,

Lillian

That's great, thanks so much for your help with that. I added the code... however, I'm not a programmer and am not sure that I added it correctly. I put it at the bottom as follows (after exit and }:

</div>
<div class="clear_both"></div>
<?php

if(JRequest::getWord('tmpl','')=='component'){

exit;
}
[<input type="hidden" name="notify_url" value=" spiritinform.myomnistar.com/paypal_plugin.php ">
<script language="JavaScript" type="text/javascript" src=" spiritinform.myomnistar.com/getaff.php "></script>


That is the code that I got from the affiliate company but now on the checkout page I am getting the following error, so I think I am doing something wrong in the adding of the code. I used my template name 'hybrid' from the dropdown under views and followed you instructions... Any suggestions would be most appreciated...

here is the error I am getting on the checkout page now:

Parse error: syntax error, unexpected '<' in /mnt/data/vhosts/casite-391544.cloudaccess.net/httpdocs/templates/rt_hybrid/html/com_hikashop/checkout/step.php on line 152