print $q -> header();
if ($q -> param) {
   # we do have something to process, lets move on
   do_process($q -> param); 
} else {
   # this is clean entry, just display options
   show_page_with_form($q);
}
# despite of previous step's outcome, show footer with copylefts and end document gracefully
show_footer($q);
print $q -> end_html;
1