.load function does not work after upgrading domain to https

I have a function that checks a database on a seperate site and the script below checks this

   <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.5.1/jquery.min.js"></script>

    <script type="text/javascript">
    $(document).ready(function(){
        loadstation();
    });

    function loadstation(){
        $("#station_data").load("signin/check.php");
        setTimeout(loadstation, 5000);
    }
    </script>

After I upgraded the site to HTTPS this does not work

Is there something I need to add to make it operational again?