How to pass array to popup window

How to pass array to popup window.Then let user to change array position then pass array back to parent windows.

What i'm trying to do is after user fill in a form, value of each field will be displayed in a text area. The popup window is for user to change the arrangement..which field first and which field not to be displayed. What i did was assign the fieldname in array so i can pass it to the popup window.

Why do you have to use window.open to open a popup? You can just play with a div's visibility on the same page so then you won't have to pass any arrays between pages.