Email and Form validation using JS Example code

<!DOCTYPE html>
<html>
<head>
<title> NEW YORK FOOD | NIGHTS</title>
<link rel="stylesheet" type="text/css" href="css/style.css">
<link rel="ico" type="image/jpg" href="img/favicon.ico">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<script src="js/jquery.validationEngine-en.js"></script>
<script>
function validateForm() {
   var x = document.forms["myForm"]["email"].value;

    var reg = /^\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*$/

       if (!reg.test(x)) {

               $("#demo").css("display","block");

   }
}
</script>

 <style type="text/css">
#demo{
display:none;
color:red;
background: #ccc;
}
</style>
</head>
<body>
<header>
<main>
<ul class="logo">
<li class="top">FOURSQUARE</li>
<li>
<select>
<option placeholder="I'm looking for">I'm looking for</option>
</select>
</li>
<li><input id="text" type="email" value="Kakinada "></li>
<li><img class="pic" src="img/search.png"></li>
</ul>
<ul class="button">
<a href="signup.html"><button>Sign Up</button></a>

</ul>
</main>
</header>
<main >
<div class="wrapper">
<form name="myForm" >
<h2>Log in to Foursquare </h2>
<div id="demo" >Email/Phone number You Entered Is Wrong</div>
<div class="box">
<p>
<label>Email or Phone Number:</label>
<input class="box" type="email" name="email" id="email" ><br>

</p>
<p>
<label>Your Password:</label>
<span>(Forgot password?)</span><br><br>
<input class="box" type="password" name="password">
</p>
<input class="login" type="button" value="Log in" onclick="validateForm()">
or<a href="#">Sign up for Foursquare</a>
</form>
</div>
</body>
</main>
</html>

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