WordPress 2.8.5 & 'Responsive Twenty Ten' - error
<p>So, According to the WordPress theme download page; the theme 'Twenty Ten' and it's child theme/plugin 'Responsive Twenty Ten' are compatible with 2.8+ </p>

<p><em>I'm stuck with using 2.8.5 at work, I don't have an answer to why - but am.</em> </p>

<p>I've uploaded both the plugin and the base theme manually - and was stoked to begin implementation of the graphical mock-up when;</p>

<pre><code>Fatal error: Call to undefined function home_url() in /data/24/1/0/139/1815302/user/1967139/htdocs/wp-content/themes/twentyten 3/header.php on line 63
</code></pre>

<p>Anyone have any suggestions as to what causes this error and how to fix it?</p>

<hr>

<p>Thanks for your response Chip; but I'm a little confused with your advice - </p>

<p>Your advising me to edit the <em>header.php</em>, but then your saying it will create more errors, so that's not really an option then?</p>

<p>But your last suggestion seems like a good idea; how do I revert the theme to the old version? Is this something your suggesting I do in the code or is there a place I can download the old version?</p>

<p><em><strong>Edit:</em></strong> On the download WP page for the 'Responsive Child theme/plug in' it says it's WordPress 2.8+ compatible - the base version I downloaded didn't specify it's compatibility so it may very well be an updated version not compatible with 2.8 - though I feel like I've seen that theme for years, so hopefully I can find an older version and get it going with the child theme. </p>

<p>-cheers!</p>
