Step1

Please replace all of the code in process.php with the following:

<?php
        $to = "you@yourdomain.com";
        $from =  $_POST["email"];
        $message = "      <strong>Name: </strong>".$_POST["name"]."
";
        $message .= "     <strong>Email Address: </strong>".$_POST["email"]."
";
        $message .= "     <strong>Company: </strong>".$_POST["company"]."
";
        $message .= "     <strong>Website: </strong>".$_POST["website"]."
";
        $message .= "     <strong>Message: </strong>".$_POST["message"]."
";
        $subject = 'New Contact';        
        $headers = "From: ".$_POST["email"]."\n";
        $headers .= "MIME-Version: 1.0" . "\r\n";
        $headers .= "Content-type:text/html;charset=iso-8859-1" . "\r\n";
        $send =    mail($to,$subject,$message,$headers);
if($send)
{
    echo "success";
}
else
{
    echo "error";
}
?>

Step2

Please include the following js file above the all other included js files.

<script src="js/jquery.min.js"></script>

That's it