sir can u tell me how to add "Auto Post Thumbnail" in wordpress

sir just look like this web site "http://www.theme-junkie.com"

Plz Sir Tell Me About This mothed

my web site is http://www.Gloori.Com

this is my free wp theme

sir this is my free wp theme link
http://fthemes.com/demonstration/?wptheme=TodaysN...

and this is download link
http://fthemes.com/download/?theme=todays-news

me not understand how to install "Auto Post Thumbnail" in my wp theme

plz sir tell me about this im waiting for ur reply
byee

Here I first set the variable $thumbnail to separate it from the code so it isn't as confusing.
Then wrap the_excerpt() and the if /else statement for the image thumb in a <div> that has the ID 'excerpt'.

Code:

<?php $thumbnail = get_post_meta($post->ID, 'thumbnail', true); // set the thumbnail custom field ?>

<div id="excerpt">
<?php the_excerpt(); ?>

<img src="
<?php
if ($thumbnail) {

/*if thumbnail custom field is set show the image src*/
echo get_post_meta($post->ID, "thumbnail", true);

} else {

/*otherwise show a default image thumb*/
echo bloginfo("template_directory") , '/default.jpg';
}
?>" alt="<?php the_title(); ?>" title="<?php the_title(); ?>" />

</div><!--//end excerpt div-->

Then in your CSS Stylesheet you do something like this.

#excerpt { color: #000; }
#excerpt img { /*selects the excerpt image */
float: left; /* This is what controls which side your image is on 'left / right' */
margin: 10px;
}

This is basically the code that I use for showing thumbnails on my sites. If you are unable to get it to work, you may have a conflict CSS image style that is over-riding it.

Hope this helps

If interested, I posted a tutorial on New2WP.com on how to show category thumbnail images as the post thumbnail, instead of a newly defined image created for every new post. It has a couple different examples, 3 of which I have tested and know work.

Maybe you'd prefer trying one of those options.
http://new2wp.com/noob/2-5-ways-to-show-category-...

<?php $thumbnail = get_post_meta($post->ID, 'thumbnail', true); if ($thumbnail) { ?>
<img src="<?php echo get_post_meta($post->ID, "thumbnail", true); ?>" alt="<?php the_title(); ?>" title="<?php the_title(); ?>" />
<?php } else { ?>
<img src="<?php bloginfo('template_directory'); ?>/default.jpg" alt="<?php the_title(); ?>" title="<?php the_title(); ?>" />
<?php } ?>

This i know works, for sure.

$thumb = get_post_meta($post->ID, 'thumbnail' , true); // 'thumb' is the key in the custom fields
$thumb = ( !empty( $thumb) ) ? $thumb: '/link/your/default-image.jpg'; // add a default image if no value exist in the custom field 'thumbnail'
echo '';

Here's how you can do it though

http://markjaquith.wordpress.com/2009/12/23/new-in-wordpress-2-9-post-thumbnail-images/

Happy to help.