anchor.diff:     </thead>
   
   </table>
  +<div id="drugs_wait"><img src="images/ajax-loader.gif"/></div>
  +
   
   
   <h2 class="pv-drugs-header">Clinical trials of interest</h2>
  
positive.code:                         keywords.push(drug[2]);
                      }
  
                      $("#pv-drugs-table").dataTable();
                      populateClinicalTrialsTable(keywords);
                  }
          );
  
negative.code:         $.post("drugs.json",
                  { drug_ids: drugIds.join(",") },
                  function(data) {
                      $("#drugs_wait").hide();
                      for(var i=0; i < data.length; i++) {
                          var drug = data[i];
  
  