// <form id="login" method="post" action=""/>

function login(){
    $data=$(this).serialize();
    $.ajax({
        url: "login.php",
        type: "post",
        data: $data,
        dataType: "JSON",
        success: function(data){
            // JSON Response: {"status":"Success"}
            alert(data.status);
            // Alert(Success)
        }
    });
    return false;
)