p { max-width:640px; }

// title
if( has_post_thumbnail()){
    the_post_thumbnail('lead_image');
}
//content

jQuery(document).ready(function($){
  var body = $('body');
  if((body.hasClass('home') || body.hasClass('archive') || body.hasClass('search')){
	  $('.carousel').carousel({
		  interval: 4000
	  });
  }
});

    var options = {
        success:    showResponse,  // post-submit callback
        url:       ajaxurl
    };

    // bind to the form's submit event
	$('input.image_upload').change(function() {

        $('#image_form').ajaxSubmit(options);

        return false;

	});

	function showResponse(responseText, statusText, xhr, $form)  {

		$('.imgpreview').html(responseText);

	}

$(this).siblings('imgpreview').html(responseText);

$('.file input.image_upload').change(function(fun) {

	$('#atloginform').ajaxSubmit({

		url:       ajaxurl,

        success: function(responseText) {

			$(this).closest('.imgpreview').html(responseText);

        },
    });

});

$(this).parent().children('div .imgpreview').first().html(responseText); ?

$('.file input.image_upload').change(function(fun) {
        var inputval = this;

	$('#atloginform').ajaxSubmit({

		url:       ajaxurl,

        success: function(responseText) {

			$(inputval).closest('.imgpreview').html(responseText);

        },
    });

});

function update_user_score($content){
    global $post;
    $author_id = $post->post_author;
    $author_posts = get_posts( array(
    'author' => $author_id,
    'posts_per_page' => -1
  ) );
    $counter = 0;
    foreach ( $author_posts as $post )
  {
    $score = get_post_meta( $post->ID, 'ratings_score', true );
    $counter += $score;
  }
    update_user_meta( $post->post_author, 'fame_score', $counter);
    return $content;
}

foreach ( $author_posts as $author_post )

<div class="featured-image">
	<a href="<?php the_permalink(); ?>" title="<?php the_title_attribute(); ?>">
		<?php the_post_thumbnail( 'thumbnail' ); ?>
	</a>
</div>

if(condition){

*..codes*

}

if ( $foo ) {
?>
<p>hello</p>
<?php // perfectly valid
}

function wpse_52662_callback( $m ) {
	if ( is_single() ) {
		$extra = 'CUSTOM CODE';
	}
		return ( FALSE === strpos( $m[2], '<img' ) ) ? $extra.$m[0] : $m[0].$extra;
}

function wpse_52662_callback( $m ) {
	if ( is_single() ) {
		$extra = 'CUSTOM CODE';

		return ( FALSE === strpos( $m[2], '<img' ) ) ? $extra.$m[0] : $m[0].$extra;
	}
}