php - updating variable inside label without refresh -

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simply, want display number of unread messages in label inside menu follows:

 <li><a id="2" style="background-image:url('menu icons/comments.png'); background-repeat: no-repeat; background-position: left; background-position-x: 5px;"                        href= "viewmessages.php">messages<label id="num_msg">(<?php echo $count; ?>)</a></li>

where $count as:

$num_messages = mysql_query("select count(m.message_id) cnt messages m inner join member_message_member mmm on (m.message_id = mmm.message_id)                     mmm.member_id2 = $id , m.seen = 0") or die(mysql_error());                     $mcount = mysql_fetch_assoc($num_messages);                     $count = $mcount['cnt'];

and when user clicks on message:

 $("#sub a").click(function(){                     mesg_id = $(this).attr('msg_id');                     page = $(this).attr('href')                     id = $(this).attr('mid');                     $.ajax ({                             data: {message_id:mesg_id},                             type: 'post',                             url:  'seen_messages.php',                             success: function(response) {                                 if (response == 1) {                                  } else {                                     alert(response);                                 }                             }                         });                 });

seen_messages.php:

@mysql_connect("localhost", "root", "") or die(mysql_error());     mysql_select_db("mydb") or die(mysql_error());     $message_id = $_post['message_id'];    mysql_query("update `messages` set `messages`.`seen` = true message_id={$message_id}") or die (mysql_error());    echo "1";

everything working properly, except have refresh page update $count, there anyway update variable inside label without manual refresh?

make seen_messages.php respond updated unread count, instead of 1, use response update user interface:

// ... success: function(response) {    if (isnan(response)) {        alert('error!');    } else {        $('#num_msg').text(response);    } }

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