is this code safe from hacking?? or hacker can manipulate it and gain access to admin privileges?

    function submit_login()
{
    $.ajax({
          type: "POST",
          url: "index.php",
          data: "username="+$("#username").val()+"&password="+$("#password").val()+(( $("#remember:checked").val() !== undefined ) ? "&remember=1" : ''),
          success: function(data){
             if (data){
                window.location.reload(true);
             }else{
                $('.error').effect('pulsate',100);
               /* $('#username, #password').animate({
                                    backgroundColor: "#aa0000",
                                    color: "#fff"
                                }, 1000 ); */
            }
     }
    });
}