Code (JS)
 $(function(){
 function ajaxindicatorstart(text)
 {
 if(jQuery('body').find('#resultLoading').attr('id') != 'resultLoading'){
 jQuery('body').append('<div id="resultLoading" style="display:none"><div><img src="ajax-loader.gif"><div>'+text+'</div></div><div class="bg"></div></div>');
 }
 
 jQuery('#resultLoading').css({
 'width':'100%',
 'height':'100%',
 'position':'fixed',
 'z-index':'10000000',
 'top':'0',
 'left':'0',
 'right':'0',
 'bottom':'0',
 'margin':'auto'
 }); 
 
 jQuery('#resultLoading .bg').css({
 'background':'#000000',
 'opacity':'0.7',
 'width':'100%',
 'height':'100%',
 'position':'absolute',
 'top':'0'
 });
 
 jQuery('#resultLoading>div:first').css({
 'width': '250px',
 'height':'75px',
 'text-align': 'center',
 'position': 'fixed',
 'top':'0',
 'left':'0',
 'right':'0',
 'bottom':'0',
 'margin':'auto',
 'font-size':'16px',
 'z-index':'10',
 'color':'#ffffff'
 
 });
 jQuery('#resultLoading .bg').height('100%');
 jQuery('#resultLoading').fadeIn(300);
 jQuery('body').css('cursor', 'wait');
 }
 function ajaxindicatorstop()
 {
 jQuery('#resultLoading .bg').height('100%');
 jQuery('#resultLoading').fadeOut(300);
 jQuery('body').css('cursor', 'default');
 }
 
 
 
 jQuery(document).ajaxStart(function () {
 //show ajax indicator
 ajaxindicatorstart('loading data.. please wait..');
 }).ajaxStop(function () {
 //hide ajax indicator
 ajaxindicatorstop();
 });
 $('#frmRegister').validator().on('submit', function (e) {
 if (e.isDefaultPrevented()) {
 // handle the invalid form... 
 console.log('Invalide'); 
 } else {
 // everything looks good!
 console.log('Valid');
 var data= {
 email:$('#email').val(),
 inputPassword:$('#inputPassword').val()
 }
 
 //Show Loading 
 $.ajax({
 type: "POST",
 dataType: "json",
 contentType: "application/json; charset=utf-8",
 url: "view/login/insert_account.php", //Relative or absolute path to response.php file
 data: data,
 success: function(data) { 
 //Hide loading 
 console.log(data);
 }
 });
 
 return false;
 }//end else
 });//end register
});
Code (PHP)<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Login to Everdwell</title>
<link rel="stylesheet" href="bootstrap-3.3.4/css/bootstrap.min.css">
<!-- Optional theme -->
<link rel="stylesheet"
 href="bootstrap-3.3.4/css/bootstrap-theme.min.css">
<!-- Latest compiled and minified JavaScript -->
</head>
<body>
 <link
 href="//maxcdn.bootstrapcdn.com/font-awesome/4.1.0/css/font-awesome.min.css"
 rel="stylesheet">
 <div id="login-overlay" class="modal-dialog">
 <div class="modal-content">
 <div class="modal-header">
 <button type="button" class="close" data-dismiss="modal">
 <span aria-hidden="true">×</span><span class="sr-only">Close</span>
 </button>
 <h4 class="modal-title" id="myModalLabel">Login to site.com</h4>
 </div>
 <div class="modal-body">
 <div class="row">
 <div class="col-xs-6">
 <div class="well">
 <form data-toggle="validator" role="form" action="" method="post">
 <div class="form-group">
 <label for="inputName" class="control-label">Email</label> <input
 type="email" class="form-control" id="mail" name="mail"
 placeholder="Enter Email" required>
 </div>
 <div class="form-group">
 <label for="inputName" class="control-label">Password</label> <input
 type="password" class="form-control" id="pass" name="pass"
 placeholder="Enter Password" required>
 </div>
 <div id="loginErrorMsg" class="alert alert-error hide">Wrong
 username og password</div>
 <div class="checkbox">
 <label> <input type="checkbox" name="remember" id="remember">
 Remember login
 </label>
 <p class="help-block">(if this is a private computer)</p>
 </div>
 <button type="submit" class="btn btn-primary btn-block">Login</button>
 <a href="/forgot/" class="btn btn-default btn-block">Forgot
 Password</a>
 </form>
 </div>
 </div>
 <div class="col-xs-6">
 <form data-toggle="validator" role="form" id="frmRegister">
 <div class="form-group">
 <label for="inputName" class="control-label">Email</label> <input
 type="email" class="form-control" id="email" name="email"
 placeholder="Enter Email" required>
 </div>
 <div class="form-group">
 <label for="inputPassword" class="control-label">Password</label>
 <input type="password" data-minlength="6" class="form-control"
 id="inputPassword" name="inputPassword" placeholder="Password" required> <span
 class="help-block">Minimum of 6 characters</span>
 </div>
 <div class="form-group ">
 <label for="inputPassword" class="control-label">Confirm Password</label>
 <input type="password" class="form-control"
 id="inputPasswordConfirm" name="inputPasswordConfirm" data-match="#inputPassword"
 data-match-error="Whoops, these don't match"
 placeholder="Confirm" required>
 <div class="help-block with-errors"></div>
 </div>
 
 
 <div id="loginErrorMsg" class="alert alert-error hide">Wrong
 username og password</div>
 <div class="checkbox">
 <p> </p>
 </div>
 <button type="submit" class="btn btn-primary btn-block" id='btnNewAcount' >Create My Account</button>
 </form>
 </div>
 
 </div>
 </div>
 </div>
 </div>
 <script src="js/northernSmile/register.js"></script>
 <script type="text/javascript" src="//ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"></script>
</body>
</html>
Code (PHP)
<?php
require 'connect_mysqli.php';
$email = isset($_POST['email']) ? trim($_POST['email']) : "";
 $sqli = "select * from usertable where Login ='{$email}' ";
 
 $result = $mysqli->query($sqli);
 if(mysqli_num_rows($result)>0)
{
 
 
 /* echo 'Please enter a new duplicate emails',"<br><br>"; */
 echo "<script>alert('Please enter a new duplicate emails');window.location='index.php';</script>";
 exit(0);
}
 $sqli = " insert into usertable (Login, Password)
 values 
 (
 '{$mysqli->escape_string($_POST['email'])}'
 , '{$mysqli->escape_string(md5($_POST['inputPassword']))}' 
 
 );
 ";
 
 $result = $mysqli->query($sqli);
 
 
 if($result){
 
 
 echo json_encode(array('status' => 'true'));
 
 
 }else{
 
 echo json_encode(array('status' => 'false'));
 
 exit(0);
 
 }
?>