Multiply input value on keyup and add them
<p>I have some input generated like that</p>

<pre><code>while($donnees = mysql_fetch_array($reqmodel)){
?&gt;
&lt;form action="#" name="order" method="post"&gt;
&lt;div style='float:left;width:100%'&gt;
&lt;input type='text' name='order_item_sku[]' value='&lt;?php echo $donnees['product_sku'] ;?&gt;'&gt;
&lt;input type='text' name='product_quantity[]' value='0' id="qty[]"&gt;
&lt;input type='text' name='product_name[]' value='&lt;?php echo $donnees['product_name'] ;?&gt;'&gt;
&lt;input type='text' name='product_id[]' value='&lt;?php echo $donnees['virtuemart_product_id'] ;?&gt;' style='width: 15px;'&gt;
&lt;input type='text' name='product_price[]' value='&lt;?php echo $price = number_format($donnees['product_price']*1.196,0) ;?&gt;' style='width: 25px;' id="prix[]"&gt;
</code></pre>

<p>Then i don't know how many input i'll get. How can i have the <code>total price</code> by multiply <code>product_quantity * product_price</code> for each row ?</p>
