Problem with includes

No ideas??
Please

Ok.
This is my index.php

<?php get_header(); ?>
<div id="wrapper">
<div class="head">
<h1><span><a>/" title="Hompage"><?php bloginfo('name'); ?></a></span></h1>
<?php include (TEMPLATEPATH . '/searchform.php'); ?><br class="clear" />
</div>
<div class="content">
<?php if (have_posts()) : ?>

<?php  if (is_category()) { ?>
<h2><?php echo single_cat_title(); ?></h2>
<?php  } elseif (is_single()) { ?>
<h2><?php the_title(); ?></h2>
<?php } elseif (is_home()) { ?>
<h2>News</h2>
<?php  } elseif (is_day()) { ?>
<h2>Articles <?php the_time('j \d\e F \d\e Y'); ?></h2>
<?php  } elseif (is_month()) { ?>
<h2>Articles <?php the_time('F \d\e Y'); ?></h2>
<?php  } elseif (is_year()) { ?>
<h2>Articles <?php the_time('Y'); ?></h2>
<?php } elseif (is_search()) { ?>
<h2>Results</h2>
<?php  } elseif (is_author()) { ?>
<h2>About</h2>
<?php } elseif (isset($_GET['paged']) && !empty($_GET['paged'])) { ?>
<h2>Archive</h2>
<?php } ?>
<?php while (have_posts()) : the_post(); ?>
<?php if (in_category('10')) continue; ?>
<h3><a>" title="<?php the_title(); ?>"><?php the_title() ?></a></h3>
<small><?php the_time('j \d\e F \d\e Y') ?></small>
<?php the_content('(more...)'); ?>
<?php endwhile; ?>
<?php else : ?>
<h2>Not found</h2>
text

<?php endif; ?>
<p class="masizq"><?php next_posts_link('&laquo; old') ?>

<p class="right"><?php previous_posts_link('next &raquo;') ?>

</div>

</div>

<?php include (TEMPLATEPATH . '/column2.php'); ?>

<?php include (TEMPLATEPATH . '/column3.php'); ?>
<br class="clear" />
</div>

<?php get_footer(); ?>
</body>
</html>

And in both includes I have the same code:

<?php if (is_page())
{
echo 'I am a page';
}
else
{
echo 'I am not a page';
}
?>

The problem is that first include shows me “I am a page” but the second one shows me “I am not a page”.

I cant find a solution.