[Don L]

try experimenting with the weighting given to keywords found in certain areas. It sounds like you want to highly favor keywords found in the title so try bumping up $topscore for the title section.

Maybe something like ($topscore changed from 4 to 10 for by_title):

   #
   # Generate additional fields string
   #
   $add_fields_string = '';
     $scorestr="";
     // Add score to fields - LNJ
     if (!empty($data["by_title"]) && count($search_words)>0) {
          $scorestr.="if($sql_tbl[products].product like '%". $data["substring"] ."%',5,0) + ";  //Add high score for exact match - LNJ
          $topscore=10; // Yeah I know HARDCODED - LNJ
          $scoredesc=$topscore/count($search_words); //Get decrementing number for scores - LNJ
          foreach($search_words as $search_word){
               $scorestr.="if($sql_tbl[products].product like '%". $search_word ."%',$topscore,0) + "; //add individual word score - LNJ
               $topscore=$topscore-$scoredesc; //Descrement individual score for word - LNJ
          }
     }
     if (!empty($data["by_shortdescr"]) && count($search_words)>0) {
          $scorestr.="if($sql_tbl[products].descr like '%". $data["substring"] ."%',3,0) + ";   //Add high score for exact match - LNJ
          $topscore=2;
          $scoredesc=$topscore/count($search_words);  //Get decrementing number for scores - LNJ
          foreach($search_words as $search_word){
               $scorestr.="if($sql_tbl[products].descr like '%". $search_word ."%',$topscore,0) + "; //add individual word score - LNJ
               $topscore=$topscore-$scoredesc;//Descrement individual score for word - LNJ
          }
     }
     if (!empty($data["by_longdescr"]) && count($search_words)>0) {
          $scorestr.="if($sql_tbl[products].fulldescr like '%". $data["substring"] ."%',3,0) + ";    //Add high score for exact match - LNJ
          $topscore=2;
          $scoredesc=$topscore/count($search_words);   //Get decrementing number for scores - LNJ
          foreach($search_words as $search_word){
               $scorestr.="if($sql_tbl[products].fulldescr like '%". $search_word ."%',$topscore,0) + "; //add individual word score - LNJ
               $topscore=$topscore-$scoredesc;//Descrement individual score for word - LNJ
          }

     }

See if you can find optimal settings for the results you're looking for.