Do the validation and processing within the same script. This would be my perferred choice. If validation fails, print an error and the form again. If the validation is successful, process the request and print a results page.
Access script2.cgi HTTP GET rather than a POST. Just put your CGI variables in to a query string and append on to the end of the URL for the second script. Then put that URL into a meta refresh tag in the HTML header e.g.
Snippets of code should be wrapped in
<code> tags not<pre> tags. In fact, <pre>
tags should generally be avoided. If they must
be used, extreme care should be
taken to ensure that their contents do not
have long lines (<70 chars), in order to prevent
horizontal scrolling (and possible janitor
intervention).