$(document).ready(function() {

    $("#login").click(function() {

        var email = $("#email").val();
        var password = $("#password").val();

        //checking for blank fields
        if (email == '' || password == '') {
            $('input[type="text"],input[type="password"]').css("border", "2px solid red");
            $('input[type="text"],input[type="password"]').css("box-shadow", "0 0 3px red");
            alert("Please fill up all the fields");
        } else {
            $.ajax({
                    type: "POST",
                    url: "http://localhost/Reward/applogin.php",
                    data: {email1: email, password1: password},
                    dataType: 'JSONP',
                    crossDomain: true,
                    cache: false,
                    success: function(data) {
                        if (data == 'Invalid Email.......') {
                            $('input[type="text"]').css({
                                "border": "2px solid red",
                                "box-shadow": "0 0 3px red"
                            });
                            $('input[type="password"]').css({
                                "border": "2px solid #00F5FF",
                                "box-shadow": "0 0 5px #00F5FF"
                            });
                            alert(data);
                        } else if (data == 'Email or Password is incorrect') {
                            $('input[type="text"],input[type="password"]').css({
                                "border": "2px solid red",
                                "box-shadow": "0 0 3px red"
                            });
                            alert(data);
                        } else if (data == 'Successfully Logged in') {
                            $("form")[0].reset();
                            $('input[type="text"],input[type="password"]').css({
                                "border": "2px solid #00F5FF",
                                "box-shadow": "0 0 5px #00F5FF"
                            });

                            alert(data);
                        } else {
                            alert(data);
                        }

                    }
            })
        }
    });
});

<?php
header('Content-Type: application/json');
// Establishing connection with server..
 $con = mysqli_connect("localhost","root","reward");

// Selecting Database
 $db = mysql_select_db("reward", $con);

//Fetching Values from URL
$acc_email=$_POST['email1'];
$acc_pwd= sha1($_POST['password1']);  // Password Encryption, If you like you can also leave sha1

// check if e-mail address syntax is valid or not
$acc_email = filter_var($acc_email, FILTER_SANITIZE_EMAIL); // sanitizing email(Remove unexpected symbol like <,>,?,#,!, etc.)

if (!filter_var($acc_email, FILTER_VALIDATE_EMAIL))
 {
    echo "Invalid Email";
 }
else
 {//matching user input email and password with stored email and password in database
    $result = mysql_query("SELECT * FROM account WHERE acc_email='$acc_email' AND acc_pwd='$acc_pwd'");
    $data = mysql_num_rows($result);

    if($data==1)
      {
         echo json_encode("Successfully Logged in");
      }
    else
      {
        echo json_encode ("Email or Password is incorrect");
      }
 }

//connection closed
mysql_close ($con);
?>