How can I stop repeating the post already declared Feature Posts on Front Page

I am a novice in Coding Language. I want Feature Posts at my WordPress Front Page. I already have put the display code and its working fine. But the problem is this, that the same Posts repeats on the Front Page with the loop which a different that normal Index pages. Here is the first part of code of my Front Page which displays Feature Posts well: (here Category=13 is my Feature Category)
<tr>
<td colspan=”3″ id=”vert” style=”border: 1px solid #CCCCCC;”>

<table width=”100%” border=”0″ bgcolor=”#F3F7F8″>

<tr><td width=”90″ height=”90″ valign=”top”>
<img src=”<?php bloginfo(‘stylesheet_directory’); ?>/images/exclusive.gif” align=”left” alt=”Exclusive” border=”0″>
</td>
<td halign=”middle”>
<?php $feature_post = get_posts( ‘category=13&numberposts=3’ ); ?>
<?php if( $feature_post ) : ?>
<?php foreach( $feature_post as $post ) : setup_postdata( $post ); ?>
<?php $feature_post_id = $post->ID; ?>
” rel=”bookmark” title=”Permanent Link to <?php the_title(); ?>”><font size=3 color=red><?php the_title(); ?></font></td></tr>

<tr><td colspan=”2″ valign=”top”>
<div class=”horz”>
<?php the_content(‘..details..’); ?> </div>
<?php endforeach; ?>
<?php endif; ?> </td></tr></table>

</td>
</tr>

This is the Normal Loop which repeats the Featured Posts in different categories :
<tr>
<td colspan=”3″>
<table width=”100%” cellspacing=”0″ cellpadding=”0″>
<? $kategori = 3; while ( $kategori < ($totalkategori) ) { $kategori++; ?>
<tr>
<td id=”vert”>
“><img src=”<?php bloginfo(‘stylesheet_directory’); ?>/images/<?php echo “$kategori” ?>.jpg” border=”0″ alt=”More Similar Articles..”>
</td>
<td id=”vert”>
<?php $posts = get_posts( “category=$kategori&numberposts=1” ); ?>

<?php if( $posts ) : ?>
<?php foreach( $posts as $post ) : setup_postdata( $post ); ?>

<div class=”post” id=”post-<?php the_ID(); ?>”>
” rel=”bookmark” title=”Permanent Link to <?php the_title(); ?>”><h2><?php the_title(); ?></h2>
<?php the_content(‘<i>..read more »</i>’); ?>
</div>
<?php endforeach; ?>
<?php endif; ?>
</td>
</tr>
<?php } ?>
</table>
</td>
</tr>

I am sorry for these above bulky entries!
Can any body help me that what a piece of code can be added in the 2nd Part of code which could block the Feature posts repeat and force 1 offset post in different categories?