Using rjs for preview of form b4 save? i think i know

hi, i have a form that i would like to show a preview of what the posted
data would look like after the user presses the preview button…

basically i would need to call the preview action, render the data to a
partial, and bam -> preview complete. is it possible that the preview
window can be opened in a new window?

also, in order to save the data after the user selects submit from the
preview box, that data i guess should be saved in a session or