if (document.referrer) {
  var url = "http://www.searchfeed.com/rd/js/ref.jsp?pID=12390&record=1&ref=" + escape(document.referrer);
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} else {
  var url = "http://www.searchfeed.com/rd/js/ref.jsp?pID=12390&record=1&ref=NONE";
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}