HTML & CSS How to identify duplicate form elements with same name in a funcation????

Hi guys,

I have multiple price and quantity fields and their total ( price * quantity) in a loop with same form name and I want to calculate the total in each row with onChange event.

Since they have same name how do I identify the exact fields. Please see example and give me a hint on how I can grab the exact changed field to calculate the corresponding total.

The grand total field is outside the loop and would be the sum of all totals

%
for (i=0; i<5; i++)
{
%>

<input type="text" name = "price"> <input type="text" name = "quantity"> <input type="text" name = "total">

<% } %>

<input type="text" name="grand_total" >
Pls guide me to correct this.

Thanks,
Riju.