note 57858 added to function.header

As I have been working with XHTML and XML I have noticed that a php file with the following header information: <?php header('content-type: application/xhtml+xml; charset="iso-8859-1"'); header('content-disposition: inline; filename="index.html"'); ?> will look fine in a gecko based browser, but IE displayes it as markup as if I was looking at the source of the output. Now if I save the output to some .html file IE renders it correctly (if you can call that correctly). I tried setting the content type to text/html, text/xml, and application/xhtml+xml (which is what it should be). No dice. Any ideas? The site I am working on is in development at www.aproximation.org if you want to see glorious IE in action. Thanks for any help you might offer! ---- Manual Page -- http://www.php.net/manual/en/function.header.php Edit -- http://master.php.net/manage/user-notes.php?action=edit+57858 Delete: added to the manual -- http://master.php.net/manage/user-notes.php?action=delete+57858&report=yes&reason=added+to+the+manual Delete: bad code -- http://master.php.net/manage/user-notes.php?action=delete+57858&report=yes&reason=bad+code Delete: spam -- http://master.php.net/manage/user-notes.php?action=delete+57858&report=yes&reason=spam Delete: useless -- http://master.php.net/manage/user-notes.php?action=delete+57858&report=yes&reason=useless Delete: non-english -- http://master.php.net/manage/user-notes.php?action=delete+57858&report=yes&reason=non-english Delete: already in docs -- http://master.php.net/manage/user-notes.php?action=delete+57858&report=yes&reason=already+in+docs Delete: other reasons -- http://master.php.net/manage/user-notes.php?action=delete+57858&report=yes Reject -- http://master.php.net/manage/user-notes.php?action=reject+57858&report=yes Search -- http://master.php.net/manage/user-notes.php