Browser mask does not work

    Hi,


    When I try to download the source html of a webpage - browser mask does not seem to work.
    For example - with this link :-
    http://www.nrk.no/nett-tv/klipp/699017


    using Windows IE8 or Mozilla - I get the 'strict' version of the source :

    HTML
    <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> 
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="nb"> 
<head>


    But with the 500hd - downloading the page with wget or urllib2.urlopen with masks (I tried different texts) - I only get the 'transitional' version :

    HTML
    <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">\r', ''), ('\r', ''), ('<html xmlns="http://www.w3.org/1999/xhtml" >\r', ''),


    Any comments/advice - please ?
    Cheers, pcd.