| But here's what I want to do now:  I want to use the same two 
| lines of code for any possible form data that might be submitted

mysql_list_fields retrieves all field names of $table;
with that you can build your SET-clause for the query.
something like:

        $fields = mysql_list_fields($db, $tbl);
        $columns = mysql_num_fields($fields);
        for ($i = 0; $i < $columns; $i++) {
          $fld = mysql_field_name($fields, $i);
          $set .= "$fld='$".$fld."', ";
        }

btw: mysql_query("UPDATE ..."); works and saves a line of code.

Vincent


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