on preview, loosing data using post/session..

hello, im am making a business card preview program. im passing data using.. post and session. i did use a redir on my index because i use 2 diff layout. when it redir it goes to a index site that dont have a post yet. after the users enters the data when they preview the data is ok, but when they go back to correct the fields. the entered data is being lost. is there a way to store data that it wont be lost using it's session? or post? what ever's easy will be good help. -- Thank you, Louie Miranda (louie@axishift.ath.cx)