issue with using a snippet (displaying excerpt images) as a function

Hiya to All,

I’m using a code snippet for displaying the first attachment image for excerpts on the homepage – to have a smarter and more logical code, I actually try to use this snippet as a function – but somehow I can’t.

There are different sections on the homepage for each day: a main section for the current day, and four smaller sections for the other weekdays – these latters only display post excerpts.

Well, if I repeat the same snippet in the four smaller sections, it works fine. However, when I try to use the function, the four callings of the function returns four times the image belonging to the first section.
I have a doubt that I miss something related to arguments, but not sure what and how.

The repeated snippet is:

$args = array(
                                'order'          => 'ASC',
                                'post_type'      => 'attachment',
                                'post_parent'    => $post->ID,
                                'post_mime_type' => 'image',
                                'post_status'    => null,
                                'numberposts'    => 1,
                                );

                                $attachments = get_posts($args);

                                if ($attachments) {
                                    foreach ($attachments as $attachment) {
                                        echo '<div class="eimages">' . wp_get_attachment_link($attachment->ID, 'thumbnail', false, false) . '</div>';
                                        }
                                    }
                                else { echo '<p class="center">a ' . strtolower($post->dayname) . ' with no image :(</p>'; };

When I try to “convert” this into a function, I use the following code:

function excerptImage() {
	$args = array(
	'order'          => 'ASC',
	'post_type'      => 'attachment',
	'post_parent'    => $post->ID,
	'post_mime_type' => 'image',
	'post_status'    => null,
	'numberposts'    => 1,
	);

	$attachments = get_posts($args);

	if ($attachments) {
		foreach ($attachments as $attachment) {
			echo '<div class="eimages">' . wp_get_attachment_link($attachment->ID, 'thumbnail', false, false) . '</div>';
			}
		}
	else { echo '<p class="center">a ' . strtolower($post->dayname) . ' with no image :(</p>'; };	

}

And I’m calling it in the page’s php code by using simply

<?php excerptImage(); ?>

Could you please help me with this? Do I miss the ‘argumentation’ of the function? Or what would cause that the function doesn’t return the actual excerpt’s attachment image, but that of the first excerpt – four times…

Thanks in advance for any kind of help.