my $request = new CGI;

$request->start_html();
#<html_page1>
$request->end_html();

#code abarbeiten

$request->start_html();
#<warte_seite_mit_sanduhr_GIF>
$request->end_html();

#code abgearbeitet
 
$request->start_html();
#<html_page2>
$request->end_html();

#usw.