Back Button / Forms

Hi there,

I've put together a form that has required fields. I find that if I fill out
all fields, except one of the requried fields, I go to the error message just
fine. However, when I click on the back button which has this code attached to
it:

javascript:history.back()

I lose everything that I've typed in. Is there a way to go back a page
without losing what has been already entered into the form's fields?

http://www.allaboutyouhomes.com/dev/contact.htm

Thanks much for your help.