when click Back Button javascript alert reppears

I'm using JSP to do form validation on postback...I show an alert message when a form field is invalid after verifying against database.  If the field is valid, we go to a Thank you page.  But if I hit the Back button I'm seeing the alert box again and have to click OK on the box to go back to the form.  How can I go back to the form from the Thankyou page without seeing the alert

Don't want to use cookies because what if that form field is entered invalid more than once when the user initially fills the form...
murads3Asked:
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MessiadbunnyConnect With a Mentor Commented:
I'd suggest something along the lines of checking the referral address.  So if they are coming from the thanks page then it voids all alert messages.  

  if (document.referrer != 'www.bla.com/thankspage.html')

Something along those lines.
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