is it possible to send POST data via zen_redirect?

I'm not a hugely experienced php coder but I'm trying to throw together a little mod which integrates with zencart.

I have a form which, after it gets submitted, checks that the image file which has been uploaded in the form isn't less that 500px wide. If it is I use the zen_redirect function to send the user back to the form page again. One of the form fields, however, is a text field which obviously could contain a lot of characters and it doesn't seem like a sensible idea to stick them in the zen_redirect as parameters.

I'm probably over looking something simple which makes this dead easy but I'm stuck.

Can anyone help?

thanks :)

No, you can't pass POST data via a redirect.
However, you could possibly set up some session variables which will be remembered after the redirect and then use their contents to redisplay the inputs. BUT REMEMBER TO SANITIZE ALL OF THAT INFO BEFORE RE-DISPLAYING, else you'll be opening yourself up to XSS/CSRF attacks.