Adding values from textbox to dropdown box

[fx_4118]

From this code the values are added, but the values are pasted on the same location of the dropdown box, for eg: Location1:Mango,Apple, etc. how to add the values on the same dropdown box & how to do the allocation dropdown box.

code:

<select name="dropdown" >
    <option value="">-See Here- </option>
    <?php
do {  
?>
    <option value="<?php echo $tb1; ?>"><?php echo $tb1; ?></option>
    <?php
    } while ($tb1 = mysql_fetch_assoc($tb1));
    $rows = mysql_num_rows($ADD);
    if($rows > 0) {
      mysql_data_seek($ADD, 0);
        $tb1 = mysql_fetch_assoc($ADD);
  }
?>   
      </select>