fill form - greens for good answer

I'm working on a script to do some automatic filling. I've ran into a problem that sometimes I won't know the name of a form so its hard for me to do an autofill. Here is the code to fill text from form1 to form2, how can I do the same if the second form has no name?

<SCRIPT LANGUAGE=JavaScript>
<!--
function fill()
{
	document.form2.name.value=document.form1.name.value;
	document.form2.age.value=document.form1.age.value;
}

//-->
</SCRIPT>

<input type="button" onClick="javascript:fill()" value="Fill Forms">

<form method="get" action="" name="form1">
Name <input name="name" type="text">
Age <input name="age" type="text">
</form>

<form method="get" action="" name="form2">
Name 2 <input name="name" type="text">
Age 2 <input name="age" type="text">
</form>

Code (markup):

 

Wouldn't you be able to access the form by something like:
document.forms[number].elements[number]

For example, document.forms[0].elements[0] would refer to first form, first element. This way, you can code without knowing the element name as well.

Hope this helps.