[AJAX updating <div> with php file after executing another php file]

hi everyone, im new to these forums.

 

as part of a project i'm working on i'm building a website for a large airline,

i've had my ajax working perfectly but when i logged in on the site this morning it didnt update the <div>

 

code on the page

<div align="center">
<button class="buttonup" type="button" onclick="tempup()"></button>
<script language="javascript">
function tempup() {
$("#targettemp").load("targettemp.php");
$.ajax({
url: "tempup.php", //the page containing php script
type: "POST", //request type
})
$(document).ready(function () {
$("#targettemp").load("targettemp.php");
});
}
</script>

<h4 class="target-temp panel-body" id="targettemp ">
<?php
require 'dbconnection.php';
$con;
$dbcon;
$temp = "SELECT `target temp` FROM Temperature WHERE homeid = 'BG0001' ";
$query = mysql_query($temp);
$results = mysql_result($query, 0);
echo "$results ℃";
?>
</h4>

<div align="center">
                        <button class="buttondown" type="button" onclick="tempdwn()"></button>
                        <script language="javascript">
function tempdwn() {
$("#targettemp").load("targettemp.php");
$.ajax({
url: "tempdwn.php", //the page containing php script
type: "POST", //request type
})
$(document).ready(function () {
$("#targettemp").load("targettemp.php");
});
}
                        </script>
</div>
</div>

tempdwn.php

 

 <?php
     require 'dbconnection.php';
        $con;
        $dbcon;
        $query = mysql_query("SELECT `target temp` FROM `Temperature` WHERE homeid = 'BG0001' ");
        $huidigetemp = mysql_result($query, 0);               
        $newtemp = $huidigetemp - 1;
        mysql_query("UPDATE Temperature SET `target temp`= $newtemp WHERE homeid = 'BG0001'  ");
        ?>

 

targettemp.php:

 

<?php  
require 'dbconnection.php';
                $con;
                $dbcon;

                $temp = "SELECT `target temp` FROM Temperature WHERE homeid = 'BG0001' ";
                $query = mysql_query($temp);
                $results = mysql_result($query, 0);
                echo "$results ℃";
                ?>