Multi domain tracking - mysite.com appears as Referral. What to do with the code?

Hi,

Please help, cause we really don't know what to do!

So - we have the folloiwng multidomain interactions:
MySite.com -> SecuredCart.com -> BankPage.com ->SecuredCart.com/thankyou-page.html

I have set the GATC script on every page, except BankPage.

In my Analytics reports it shows that all conversions come as "MySite.com / refferal".
So, the PROBLEM is that I can’t see the real sources that bring conversions.

WHAT TO PUT IN CODE, to make it work?


Current codes are:

1. This code is on Top (e.g. ABOVE of the onclick= button):

<script type="text/javascript">
var gaJsHost = (("https:" == document.location.protocol) ? "https://ssl." : "http://www.");
document.write(unescape("%3Cscript src='" + gaJsHost + "google-analytics.com/ga.js' type='text/javascript'%3E%3C/script%3E"));
</script>
<script type="text/javascript">
var pageTracker = _gat._getTracker("UA-xxxxxxx-x");
pageTracker._setDomainName("none");
pageTracker._setAllowLinker(true);
pageTracker._trackPageview();
</script>
--

2. Button between MySite.com and SecuredCart.com domains:

<a id="sendButton" style="font-size: 14px; background-image: url(../images/design/button.png); background-position: 0px -12px; padding-top:4px;" href="https://securedcart.com/webmmc/?WEBMMCc=11&WEBMMCp=14" onclick="pageTracker._link(this.href); return false;">Buy Now</a>


What should I put in the code, to make it work?

Thank you all!