vmunhoz

.main {
position:relative;
margin-left:20%;
}

.sub {
position:absolute;
top:0;
bottom:0;
width:20%;

vmunhoz

<?php
    $doc = new DOMDocument();
    $doc->loadHTML('<img src="http://example.com/img/image.jpg" ... />');
    $imageTags = $doc->getElementsByTagName('img');

    foreach($imageTags as $tag) {
        echo $tag->getAttribute('src');
    }
?>

vmunhoz

<?php if (have_posts()) : ?>
<?php while (have_posts()) : the_post(); ?>

<?php
$szPostContent = $post->post_content;
$szSearchPattern = '~<img [^\>]*\ />~';

// Run preg_match_all to grab all the images and save the results in $aPics
preg_match_all( $szSearchPattern, $szPostContent, $aPics );