anchor.diff:          $.post("drugs.json",
                   { drug_ids: drugIds.join(",") },
                   function(data) {
  +                    // Reset the map
  +                    drugMap = {};
  +
                       $("#drugs_wait").hide();
                       for(var i=0; i < data.length; i++) {
                           var drug = data[i];
  
positive.code:                             + '</tr>'
                          );
  
                          keywords.push(drug[2]);
                      }
  
  
negative.code: <script type="text/javascript" src="js/jquery.highlight-4.js"></script>
  <script type="text/javascript">
      var keywords = [];
      // A map from drug names to drug ids
      var drugMap = {};
  
      var populateDrugTable = function() {
          var drugIds = [];
  