javascript - How do I make new drop down boxes appear when another one has been filled in first? -


i'm building graphic representation of custom candle being made.

right now, idea customer selects scents drop down box, in order. when fill in 1 drop down box, next 1 appears, five. trouble haven't been able figure out way efficiently.

    <div class="mainbody"> <div> <span class="subtitle">build candles</span> </div> <div class="candle">     <div class="candle_top">     </div>     <div class="candle_fifth">     fifth     </div>     <div class="candle_fourth">     fourth     </div>     <div class="candle_third">     third     </div>     <div class="candle_second">     second     </div>     <div class="candle_first">     first     </div>     <div class="candle_bottom">     </div>  </div> <div class="design"> <?php $db_server="localhost"; $db_username="root"; $db_pword=""; $db_database="candles";  mysql_connect($db_server, $db_username, $db_pword); if (strlen(mysql_error())>0)      {$psubmit=5;     $sql['error']=mysql_error();     $db_server="* invalid * ";     } else mysql_select_db($db_database); ?> <form method="get"> first:  <select name="first">         <option></option>         <?php             $query = mysql_query("select * products");             while($row = mysql_fetch_array($query)){                 echo '<option>'.$row[1].'</option>';             }         ?>         </select><br />  second: <select name="second">         <option></option>         <?php             $query = mysql_query("select * products");             while($row = mysql_fetch_array($query)){                 echo '<option>'.$row[1].'</option>';             }         ?>         </select><br />  third: <select name="third">         <option></option>         <?php             $query = mysql_query("select * products");             while($row = mysql_fetch_array($query)){                 echo '<option>'.$row[1].'</option>';             }         ?>         </select><br />  fourth: <select name="fourth">         <option></option>         <?php             $query = mysql_query("select * products");             while($row = mysql_fetch_array($query)){                 echo '<option>'.$row[1].'</option>';             }         ?>         </select><br />  fifth: <select name="fifth">         <option></option>         <?php             $query = mysql_query("select * products");             while($row = mysql_fetch_array($query)){                 echo '<option>'.$row[1].'</option>';             }         ?>         </select><br />          <input type="submit" value="preview" name="submit" /> </form> </div> </div>

i thinking jquery append, don't know how go checking see if first filled. if first , second filled allow third appended. 

$('select').change(function(){     if($(this).val()!='') $(this).next('select:first').show(); }

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