HTMLParser has problems with html in script variables...

```
Response's content is no valid html: 'Unexpected end tag `p`
```

e.g.:

```
<script>
var js_sha_link='<p>***</p>';
</script>
```

or e.g.:

```
$("#preview_id_content div").html('<h2 class="noanchor">loading...</h2>');
```
