Untitled

<form name="OrderForm" action="Form.php" method="get" >
                    <div class="Form-Title">First Name:</div>
                    <input class="Box-Input" type="text" name="FirstName" maxlength="20">
                    <br>
                    <div class="Form-Title">Last Name:</div>
                    <input class="Box-Input" type="text" name="LastName" maxlength="20">
                    <br>
                    <br>
                    <div class="Form-Title">Contact Number:</div>
                    <input class="Box-Input" pattern="[0-9.]+" type="text" name="ContactNo" maxlength="11">
                    <br>
                    <div class="Form-Title">Email Address:</div>
                    <input class="Box-Input" name="Email" type="text" id="Email" maxlength="50">
                    <br>
                    <br>
                    <div class="Form-Title">Date/Time:</div>
                    <input class="DateTime-Input" name="Date" type=Date min=2014-12-11>
                    <input class="DateTime-Input" name="Time" type=Time min=9:00 max=21:00>
                    <br>
                    <br>
                    <input class="SRButtons" type="submit" name="SubmitForm" value="Submit" onclick="ValidateFields()">
                    <br>
                </form>

<html>
<body>

<?php
if(isset($_GET['SubmitForm'])){
    $To = "rajan2615@hotmail.co.uk";
    $From = $_GET['Email'];
    $First_Name = $_GET['FirstName'];
    $Last_Name = $_GET['LastName'];
    $Subject = "Table Booking";
    $Subject2 = "Table Booking Confirmation";
    $Message = $First_Name . " " . $Last_Name . " Wrote the Following:" . "nn" . $_GET['We Would like to Book the Current Table, my Detail and the Booking Details are in this email too.'];
    $Message2 = "Here is a Copy of Your Message " . $first_name . "nn" . $_GET['We Would like to Book the Current Table, my Detail and the Booking Details are in this email too.'];
    $Headers = "From:" . $From;
    $Headers2 = "To:" . $To;
    mail($To,$Subject,$Message,$Headers);
    mail($From,$Subject2,$Message2,$Headers2);
    echo "Mail Sent. Thank you " . $First_Name . ", We Will Contact You Shortly.";
    }
?>

Thank You: <?php echo $_GET ["FirstName"]; ?><br>
Your Table is Booked for: <?php echo $_GET ["Date"]; ?><br>
At: <?php echo $_GET ["Time"]; ?><br>
Confirmation is Sent To: <?php echo $_GET ["Email"]; ?>

</body>
</html>