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my $cgi = new CGI;              
my $pjx = new CGI::Ajax( 'exported_func' => \&perl_func );
...
#rest of HTML code
return $html;
}

my $sec_pjx = new CGI::Ajax( 'exported_func' => \&sec_perl_func );
print $sec_pjx->build_html( $cgi, \&Show_HTML);