Sometimes you need to perform actions only for returning users who have logged into your checkout, such as displaying a 'welcome back' message or displaying special options or pricing for valued customers. This code lets you run logic only when they successfully log in.

Paste the following code above the closing </head> tag in your checkout template:

<script type="text/javascript" charset="utf-8">
jQuery(document).ready(function() {
  jQuery(document).ajaxComplete(function(event, request, settings) {
    if (settings.url.indexOf('CheckLogin') != -1) {
      if (jQuery("#customer_id").val() != 0) {
        // Logic for logged in users here
      }
    }
  });
});
</script>

• http://forum.foxycart.com/discussion/5518/help-with-additional-functionality-of-sso