<div class="modal-body">
        <form>
        <div class="form-group">
            <label for="email" class="col-form-label">Email address:</label>
                    <input type="email" class="form-control" id="signUpEmail" name="email">
        </div>
            <div class="form-group">
        <label for="pwd" class="col-form-label">Password:</label>
        <input type="password" class="form-control" id="signUpPassword" name="password" onchange="check_pass()">
                                         </div>
                                                <div class="form-group">
                                                    <label for="pwd" class="col-form-label">Confirm Password:</label>
                                                    <input type="password" class="form-control" id="signUpConPassword" name="password" onchange="check_pass()">
                                                </div>
                                            </form>
                                        </div>
                                        <div class="modal-footer">
                                            <button type="submit" class="btn btn-primary" id="signUpSubmit" disabled="true" >Sign Up</button>

                                        </div>
                                    </div>
                                </div>
                            </div>

        <script type="text/javascript">
            function check_pass()
            {
                //alert(document.getElementById('signUpPassword').value);
            if (document.getElementById('signUpPassword').value ==
                    document.getElementById('signUpConPassword').value) {
                document.getElementById('signUpSubmit').disabled = false;
            }
            else
            {
                document.getElementById('signUpSubmit').disabled = true;
            }
        }
        $('#signUpSubmit').click(function()
        {
            //alert("signup completed");
            var email=document.getElementById('signUpEmail');
            var password = document.getElementById('signUpPassword');
            $.ajax({
                url: 'signup.php',
                type: 'POST',
                data: {
                    email: $email,
                    password: $password
                },
                success: function() {
                    alert('Email Sent');
                }
            });
        });
        </script>

var email=document.getElementById('signUpEmail').value;
var password = document.getElementById('signUpPassword').value;