Trouble in phplib template: multi blocks

[mad4u]

hi, all, i got this trouble for a few hours.

below is my code:

index.html

<!-- BEGIN block1 -->
{vars}
<!-- END block1 -->

<!-- BEGIN block2 -->
{vars2}
<!-- END block2 -->

index.php

<?php
inclue "template.inc";

$t->new Template("./");

$t->set_file("index","index.html");
$t->set_block("index", "block1", "rows");
$t->set_block("index", "block2", "rows2");

// block1's loop
$i = 0;
while($i<10){
    $t->set_var(array("vars" => $i));
    $t->parse("rows","block1",true);
    $i++;
}

$j = 0;
while($j<10){
    $t->set_var(array("vars2" => $j));
    $t->parse("rows2","block2",true);
    $j++;
}

$t->parse("output","index");
$t->p("output");
?>

it's no problem in one loop condition.
no.1 loop can display, but no.2 shows nothing, or can't show its vars.

I want to know how to CODE in multi loop blocks..

Thanks, any one can tell me why??😕 🙁 🙁