Sum of form fields

[ipslayer]

Ok the code goes like this:

// JavaScript Document
function updatesum() {
document.sumario.total.value = (document.sumario.precio[]1.value -0) + (document.sumario.precio[]2.value -0) + (document.sumario.precio[]3.value -0) + (document.sumario.precio[]4.value -0) + (document.sumario.precio[]5.value -0) + (document.sumario.precio[]6.value -0) + (document.sumario.precio[]7.value -0);

I know that the problem here is the field name, but how do i make this work without having to change the names?

I can't change them because i have many other functions with those names already.

[Fang]

document.sumario.elements['precio[]1'].value

[ipslayer]

still not working look at the live form, here it is.

http://www.foreverchef.com/test/forma.php

and here's my sum code.

http://www.foreverchef.com/test/autosum.js

[Fang]

updatesum does not have a closing bracket. Check the JavaScript Console.

[ipslayer]

I updated the code, but it still dosen't work, the field box dosent show the total.

I also tried using (getElementsByName) and it didn't work either.

[Fang]

I can not see that updatesum is called anywhere?

[ipslayer]

ok, great it works now! thanks.

It's now printing in total (A), but now i need to do a couple other things.

I want to print the same result to field (11)

And i want to make a second sum for fields (1) to (10) and print them on field (12) and them sum (11) + (12) and print it on field (13).