<?php
$selector = 'img[src], link[href], script[src]';
$filter = ':not([href^=<?php])'
    . ':not([src^=<?php])'
    . ':not([href^=http://])'
    . ':not([src^=http://])'
    . ':not([src^=/])';
foreach ($self[$selector]->filter($filter) as $el) {
    $el = pq($el, $self->getDocumentID());
    // imgs and scripts
    if ($el->is('img') || $el->is('script'))
        $el->attr('src', $params[0] . $el->attr('src'));
    // css
    if ($el->is('link'))
        $el->attr('href', $params[0] . $el->attr('href'));
}