function get_ajax(my_url)
{
    $("#cnt").prepend("<div id='loading'></div>");

     $.ajax({
            method: "get",
            url: my_url,
            data: "",
             beforeSend:
             function() { $("#loading").show(); },
             complete:
             function() { $("#loading").hide(); },
             success:
             function(html) { $("#cnt").html(html); }
           }); 
}