Blank side i php?

bvorfor bliver siden blank?.. Min kode er:

<?php
include("db.php");
$hej = mysql_query("SELECT * FROM brugere where id = '$id'")  or die(mysql_error());
while ($row = mysql_fetch_array($hej)) {
echo "<TABLE height=\"0\" cellSpacing=\"0\" cellPadding=\"0\" width=\"0\" border=\"0\">
<TBODY>
<TR>
<TD vAlign=\"top\" width=\"0\" height=\"0\">&nbsp;&nbsp; <font face=\"Tahoma\" size=\"2\">Indstillinger&nbsp;-
                Online brugere - Elevator - Lejligheder</font> </TD></TR>
<TR>
<TD vAlign=\"top\" width=\"0\" height=\"0\">
<FORM action=\"skriv_ok.php?rum=$row[rum]&brugernavn=$row[brugernavn]\" method=\"post\"><font face=\"Tahoma\" size=\"2\">&nbsp;&nbsp;<INPUT class=\"input\" size=\"49\"
name=\"besked\"> <INPUT class=\"button\" type=\"submit\" value=\"send\"></font> </FORM></TD></TR></TBODY></TABLE></DIV>";
}
?>
<style>