history.back() and form value dissapear

I have a html form which submit to the second page.
On the second page, there is a link history.back().
When I submit the first page , and click the history.back() link on the second page , the browser is back to the first page , the values of all the textfield on the form is blank , which I have filled before submission. But sometime it's still there. I am confuse why sometimes the value is blank and sometime it's not.
I need the values still there.
Fyi , I use ie6. And I set the "Check for newer version of stored page" setting to "Every visit to the page".
Susilo

You always have a chance of loosing the information when you press the back button. Only way to know it will be there is to use cookies to store the information and fill in the form when the page is loaded....
Eric

Thanks!