Dynamically adding form fields

[eluser]sqwk[/eluser]
I am duplicating part of a form using jquery (Tabs). The data structure that I want to get from the form is something like this:

Code:

-field
-field
-tabs
    -tab 1
        -field
        -field
    -tab 2
        -field
etc…

How would I name the fields to prevent the form fields in tab 2 overwriting the ones in tab 1?

I know I can specify an array like so field[] but within the tabs I also have checkboxes that will need to go in their own array.

Code:

tab[][checkboxes][] // this will only work with a key of the tab
    tab[tabkey][checkboxes][]

Since the fields are duplicated by jquery later, how do a) name the field, b) keep the validation working and c) extract my data?