I am retrieving 30 bakery items from a mySQL database into a dynamic HTML table using PHP. The data retrieved are **Product**, **Item** (Primary Key), **Weight**, and **Price**. My code also creates an INPUT box, called **Quantity**, for each item so that the user can type in how many cases he wants. Below is a segment of the code used to generate the dynamic table:

```
        $i=0;

    while ($i < $num) {
        $Item=mysql_result($result,$i,"Item");
        $Product=mysql_result($result,$i,"Product");
        $Weight=mysql_result($result,$i,"Weight");
        $BGPrice=mysql_result($result,$i,"BGPrice");

    echo "<tr>";
    echo "<td>$Product</td>";
    echo "<td><INPUT NAME=Item size=5 value=$Item READONLY></td>";
    echo "<td><INPUT NAME=Weight size=5 value=$Weight READONLY></td>";
    echo "<td><INPUT NAME=Price size=5 value=$BGPrice READONLY></td>";
    echo "<td><INPUT NAME=Quantity size=5 value=0 tabindex=$i></td>";
    echo "<td><INPUT NAME=ExtPrice size=5 value=0 READONLY></td>";
    echo "<td><INPUT NAME=TotalWt size=5 value=0 READONLY></td>";
    echo "</tr>";

    $i++;
    }

```

I need JavaScript to call a function and calculate the values for Extended Price (**ExtPrice**) and Total Weight (**TotalWt**) as soon as the user enters the number of cases he would like to order.

Here's my struggle: there are 30 items in this dynamic table and each item's INPUT NAME is the same. How can I create a function that updates **ExtPrice** and **TotalWt** for each individual product?