[SMARTY] how to get javascript to read array in smarty

Hi everyone,

I have a simple form that generated another set of forms depending on how many customers are entered. 

First form: how many customers? 

Second file: If the answer is 2, it generated 2 forms with exactly the same fields. It's stored in an array. 
My question is how to have javascript read the values in that array.  This is the error I get when running the program.
Error: document.getElementsByName("num1[]")[j] has no properties.

Here's an example of  the second form:
{section name=ill start=1 loop=$customer+1 step=1}
<table border = "1">
<tr>
<td>Number 1:</td><td><input type="text" name="num1[{$smarty.section.ill.index}]"  /></td></tr>
<tr><td>Number 2:</td><td><input type="text" name="num2[{$smarty.section.ill.index}]" /></td></tr>
<tr><td>Total:</td><td><input type="text" name="total[{$smarty.section.ill.index}]"onBlur = "mytest()"  /></td></tr>
</table>
{/section}

And here's the javascript:
function mytest()
	{
		for (j = 0; j <= customer; j++)
		{
		var number1= document.getElementsByName("num1[]")[j].value;
		var number2 = document.getElementsByName("num2[]")[j].value;
		number1 = Number(number1);
		number2 = Number(number2);
		var result = number1 + number2;
		document.getElementsByName("total[]")[j].value = result;
		}
	}
Thank you for your help,
~alyssa

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