Work great on iframe but Drupal doesn't parse '#' symbol

I love this module, really. Thanks to the developers. It works great on all methods but I choose iframe because of compatibility with mods and phpbb themes. But I have problem when I put the '#' symbol on the forum URL for locating the post to avoid scrolling the whole page to read the particular single post. ex..

Without iframe (direct to forum)
http://ageslinux.com/phpBB3/viewtopic.php?f=3&t=2&p=2#p2

With this method (including # for locating post ID) the page will auto scroll to locate the post.

With Drupal (iframe method)
http://ageslinux.com/phpbbforum/viewtopic.php?f=3&t=2&p=2#p2

It didn't scroll. I just check the IFRAME documentation and this method supposedly to work. I checked the iframe source and I saw the "#p2" string was gone. By using firebug, I put the string back and it worked as expected. I tried to put many other symbols, $, %, @ and the all work.

So, my question. Which component actually strips this hash ('#') symbol? and how to parse the # into the iframe.