X-Cart forums - Google Checkout & Webgains

I have inserted the following:

Code:

<parameterized-urls>

    <parameterized-url

      url="https://track.webgains.com/transaction.html?wgver=1.1&amp;wgprogramid=programid&amp;wgrs=1&amp;wgeventid=3404&amp;wgitems=">

      <parameters>

        <url-parameter name="wgorderreference" type="order-id"/>

        <url-parameter name="wgvalue" type="order-total"/>

      </parameters>

    </parameterized-url>

  </parameterized-urls>

and on the final checkout page of google i'm getting this:

Code:

<script type="text/javascript">

        function loadAnalytics() {

        

        

           analytic1 = new Image();

           analytic1.src = "http://track.webgains.com/transaction.html?wgver\x3d1.1\x26wgprogramid\x3dprogramid\x26wgrs\x3d1\x26wgeventid\x3d3404\x26wgitems\x3d\x26wgorderreference\x3d813990644670605\x26wgvalue\x3d1.91";

        

        

        }

      </script>

the url should be: xxhttps://track.webgains.com/transaction.html?wgver=1.1&wgprogramid=programid&w grs=1&wgeventid=3404&wgitems=&wgorderreference=100 7&wgvalue=1.91

Any deas why there is loads of letters and numbers added?