# the template is just <TMPL_VAR NAME="hallo">

use HTML::Template;
use strict;
my $t=new HTML::Template( filename => "/tmp/tmpl");
print "3 ".time()."\n";
$t->param( "hallo" => \&littletest );
sleep 3;
print "2 ".time()."\n";
sleep 3;
print $t->output;
 
sub littletest {
        print "1 ".time()."\n";
        return "test";
        }