$sql = "select msgid, userid, sender, msgtxt, stime, 'interval' as c from u_msg where ((userid='$uid' and sender = '$otheruid') or (userid='$otheruid' and sender = '$uid')) order by stime asc";
$iden=mysql_query($sql);
while($rsin=mysql_fetch_array($iden)){
echo $rsin["stime"]." ".$rsin["c"]."<br>";
}