[jQuery] Form inside Form value

[Po01]

Hi, i have a HTML like that:

<form 1>
<form 2>
<field>
</form 2>
</form 1>

Supposing the field name is email, how can i get its value using
Javascript/JQuery?
I tried some stuff.. without success..

The form 2 name Im getting as a variable, like:
function values(id)
{
var ID = id;
var Form2 = "#form2_" + ID;
...
}

So i need a code that use this Form2 to get the email field value
inside it.
Tried some stuff but dunno how to do that when Form2 is inside Form1.

Thanks.