WordPress, simple function fetches all images uploaded to the current post.

functions.php

/*
This function fetches all of the images uloaded to the current post. 
Pass in the image size, and the number of images to return. 
Use this function in the loop. 
*/
function get_images_in_current_post( $size="thumbnail", $num=-1 ) {
	global $post;
	$attachments = get_posts( array("numberposts" => $num, 
									"post_type" => "attachment", 
									"post_parent" => $post->ID, 
									"orderby" => "name" ) );
	// Loop through array	
	// [img, img, img ... ]					
	foreach( $attachments as $attachment ) {
		$img = wp_get_attachment_image( $attachment->ID, $size ); 
		echo "<div class='post-img'>$img</div>";
	}
}