javascript - Discount calculation based on type of buyer -

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i'm learning javascript , working on javascript function calculate discount based on type of buyer i.e retailer/wholesaler & if it's cash or check payment. here function 

<script>     function sell()     {      var gross,net,tax,discount,unitprice,quatity,select2,select3;      unitprice=parseint(form9.unitprice.value);     quantity=parseint(form9.quantity.value);     select3=parseint(form9.select3.value);     select2=parseint(form9.select2.value);     gross=parseint(form9.gross.value);      gross=unitprice*quantity     form9.gross.value=gross;     tax=0.16*gross     form9.tax.value=tax;          if(select2='cash' && select3='retailer')          discount=0.07*gross;          else if(select2='cash' && select3='wholesaler')           discount=0.1*gross;          else if(select2='check')           discount=0*gross;      form9.discount.value=discount;        net=(gross-(discount+tax));     form9.net.value=net;      }     </script>

i created dropdown menu type of buyer, named select2

<select name="select2">           <?php {   ?>           <option value="<?php echo $row_rscustomercategory['type']?>"><?php echo $row_rscustomercategory['type']?></option>           <?php } while ($row_rscustomercategory = mysql_fetch_assoc($rscustomercategory));   $rows = mysql_num_rows($rscustomercategory);   if($rows > 0) {       mysql_data_seek($rscustomercategory, 0);       $row_rscustomercategory = mysql_fetch_assoc($rscustomercategory);   } ?>         </select>

the select menu type of sale select3

<select name="select3" id="select3">         <?php {   ?>         <option value="<?php echo $row_rssaletype['type']?>"><?php echo $row_rssaletype['type']?></option>         <?php } while ($row_rssaletype = mysql_fetch_assoc($rssaletype));   $rows = mysql_num_rows($rssaletype);   if($rows > 0) {       mysql_data_seek($rssaletype, 0);       $row_rssaletype = mysql_fetch_assoc($rssaletype);   } ?>       </select>

cash sales discount @ 7% retailer , 10% wholesaler, no discount payment check.

the problem that: upon viewing in browser , clicking on "calculate" button nothing happens. why this? appreciate whatsoever.


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