Displaying PDF embedded in PHP page with "Header", IE issue

I have a PHP page that dynamically displays a PDF page embedded within a PHP using Headers as follows:

<?php
include "database_functions.php";
$query="select * from pdf_files where pid = '".postUrlStringValue('pid',null)."'";
$res=mysql_query($query,getdbHandle());
$row = mysql_fetch_assoc($res);
extract($row);
$filename = str_replace(" ", "_", $name);
if (isset($pdfdata)) {
header("Pragma: public");
header("Expires: 0");
header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
header("Cache-Control: private",false);
header("Content-type: application/pdf");
header("Content-Disposition:inline; filename=\"$filename\"");
echo $pdfdata;
}
?>

The $pdfdata is actually coming from a database where the pdf is stored, atlhough I could put the pdf files on the server and reference them in the database.  I would prefer to keep them in a database though.

The pdf's display fine in Firefox and and Safari, but there is an error in IE where the new window will pup up for a second and then close itself, no data displayed.  Wondering if I need to change/adjust the headers, if it is a IE PDF Plug-in issue or what.  I did have a statement in there with the strlen($pdfdata) for the size of the file and that did not seem to make any difference.

Thanks.