Wordpress get_post_meta image width for lazy load - wordpress

Question

I'm trying to lazy load a page of images in Wordpress - I've tried the plugins but none of them seem to work(I only want to lazy load image on some pages.)
So I'm now trying to do it with a plugin - http://www.appelsiini.net/projects/lazyload
This plugin requires the image width and height in the img tag.
<img data-original=“img/example.jpg” src=“img/grey.gif” width=“640” height=“480”>
I'm attaching the images from custom fields like
<img src="<?php echo get_post_meta($post->ID, 'img1', true); ?>">
Is it possible get the images width and height from the get_post_meta
I've looked at wp_get_attachment_image_src but I can't see how to use it get_post_meta
======
UPDATE
======
<?php
$attachments = get_children(
array(
'post_parent' => $post->ID,
'post_status' => 'inherit',
'post_type' => 'attachment',
'post_mime_type' => 'image',
'order' => ASC,
'orderby' => 'menu_order ID'
)
);
?>
<?php
foreach ( $attachments as $attachment_id => $attachment ) {
$image_attributes = wp_get_attachment_image_src( $attachment );
?>
<img src="<?php echo $image_attributes[0];?>" width="<?php echo $image_attributes[1];?>" height="<?php echo $image_attributes[2];?>">
<?php
}
?>

Answer 1

Its better to use Wordpress Media Gallery support. You can get all images attached to post with:
<?php $attachments = get_children(
array('post_parent' => $id,
'post_status' => 'inherit',
'post_type' => 'attachment',
'post_mime_type' => 'image',
'order' => ASC,
'orderby' =>
'menu_order ID') ); ?>
where $id is a current post ID. Then with the ID's of attached images, You can simply use:
<?php foreach ( $attachments as $attachment_id => $attachment ) {
(...)
}?>
to iterate throught image Id's, and
<?php wp_get_attachment_image_src($attachment_id, $size, $icon);>
which is described: http://codex.wordpress.org/Function_Reference/wp_get_attachment_image_src, that allows You not only get url of image, but also its width and height.
The whole code can be wrapped in a shortcode function for ease of use ;).