Validation problem in Internet Explorer (Was: Internet Explorer problem)

Question

Ive found a problem on my website ive got customer details as seen below, but the validation doesn't work in Internet Explorer. So for example the date is a validation, if i dont enter anything in there then it stills go to the next page. Any ideas on what the problem is? Thanks
<input name="Company" type="text" id="Company" value="Company *" size="20" readonly />
  <input name="Company" type="text" required />
  <input name="Tel Number" type="text" id="Tel Number" value="Tel Number *" size="20" readonly />
  <input name="Tel_Number" type="tel" required/>
</p>
<p>
  <input name="Email Address" type="text" id="Email Address" value="Email Address *" size="20" readonly />
  <input name="Email_Address" type="email" value="" required/>
  <input name="Delivery Date" type="text" id="Delivery Date" value="Delivery Date *" size="20" readonly />
  <input name="Delivery_Date" type="date" value="" required/>
</p>
<p>
  <input name="Ordered By" type="text" id="Ordered By" value="Ordered By *" size="20" readonly />
  <input name="Ordered_By" type="text" value="" required/>
  <input name="PO Number" type="text" id="PO Number" value="PO Number" size="20" readonly />
  <input name="PO_Number" type="text" value="" id="PO_Number"/>
</p>
<p>
  <textarea name="Address" cols="16" rows="3" readonly id="Address">Delivery Address and Post Code *</textarea>
  <textarea name="Address" cols="20" rows="3" required ></textarea>
  <textarea name="Special Requirements" cols="35" rows="3" readonly id="Special Requirements">Special Requirements
(**EG. No of Vegetarians, Delivery Time, Gluten Free/Celiac etc..**)</textarea>
  <textarea name="Special_Requirements" cols="23" rows="3" id="Special_Requirements"></textarea>
</p>

Answer 1

Save the code below as customer_order.php and change:
// recipient
$to = "[email protected]";
This will send the information to your email address if all the required fields are filled in. The fields you dont want validated remove them from the code - for instance remove the below if you do NOT want to validate the Special Requirements form field:
$Special_Requirements = trim($_POST['Special_Requirements']);
if(empty($Special_Requirements)) {
$error['Special_Requirements'] = "Please provide any Special Requirements";
Change the below if the email is sent to point to a page which informs the sender the order has been successfully sent:
header ('Location: order_sent_successfully.php');
<!-- CODE STARTS HERE -->
<?php
if (array_key_exists('submit' , $_POST)) {
$Company = trim($_POST['Company']);
if(empty($Company)) {
$error['Company'] = "Please Provide Company Name";
$Tel_Number = trim($_POST['Tel_Number']);
if(empty($Tel_Number)) {
$error['Tel_Number'] = "Please Telephone Number";
$Email_Address = trim($_POST['Email_Address']);
// check for valid email address
$pattern = '/^[^@]+@[^\s\r\n\'";,@%]+$/';
if (!preg_match($pattern, trim($Email_Address))) {
$error['Email_Address'] = 'Please Enter a Valid Email Address';
$Delivery_Date = trim($_POST['Delivery_Date']);
if(empty($Delivery_Date)) {
$error['Delivery_Date'] = "Please Provide Deliver Date";
$Ordered_By = trim($_POST['Ordered_By']);
if(empty($Ordered_By)) {
$error['Ordered_By'] = "Please Provide Ordered By";
$PO_Number = trim($_POST['PO_Number']);
if(empty($PO_Number)) {
$error['PO_Number'] = "Please provide PO Number";
$Delivery_Address = trim($_POST['Delivery_Address']);
if(empty($Delivery_Address)) {
$error['Delivery_Address'] = "Please provide Delivery Address";
$Special_Requirements = trim($_POST['Special_Requirements']);
if(empty($Special_Requirements)) {
$error['Special_Requirements'] = "Please provide any Special Requirements";
// recipient
$to = "[email protected]";
// email subject
$subject = "Customer Order from Website";
// sender
$sender = "From: ".$_POST['Email_Address']."\r\n";
// build the email message
$message = "Order from Website.\n\n";
$message .= "Company: $Company\n\n";
$message .= "Telephone: $Tel_Number\n\n";
$message .= "Email Address: $Email_Address\n\n";
$message .= "Delivery Date: $Delivery_Date\n\n";
$message .= "Ordered By: $Ordered_By\n\n";
$message .= "PO Number: $PO_Number\n\n";
$message .= "Delivery Address: $Delivery_Address\n\n";
$message .= "Special Requirements: $Special_Requirements\n\n";
if(!isset($error)) {
mail($to, $subject, $message, $sender);
header ('Location: order_sent_successfully.php');
?>
<?php
foreach($error as $value) {
    echo "<p style='color: red;'>".$value."</p>";
?>
<form name="customer_details" action="customer_order.php" method="post">
<input name="Company1" type="text" id="Company" value="Company *" size="20" readonly />
  <input name="Company" type="text" value="<?php if(isset($Company)) { echo $Company; } ?>" />
<input name="Tel Number" type="text" id="Tel Number" value="Tel Number *" size="20" readonly />
  <input name="Tel_Number" type="tel" value="<?php if(isset($Tel_Number)) { echo $Tel_Number; } ?>"/>
</p>
<p>
  <input name="Email Address" type="text" id="Email Address" value="Email Address *" size="20" readonly />
  <input name="Email_Address" type="email" value="<?php if(isset($Email_Address)) { echo $Email_Address; } ?>"/>
  <input name="Delivery Date" type="text" id="Delivery Date" value="Delivery Date *" size="20" readonly />
  <input name="Delivery_Date" type="date" value="<?php if(isset($Delivery_Date)) { echo $Delivery_Date; } ?>"/>
<label>
</label>
</p>
<p>
  <input name="Ordered By" type="text" id="Ordered By" value="Ordered By *" size="20" readonly />
  <input name="Ordered_By" type="text" value="<?php if(isset($Ordered_By)) { echo $Ordered_By; } ?>" />
  <input name="PO Number" type="text" id="PO Number" value="PO Number" size="20" />
  <input name="PO_Number" type="text" id="PO_Number" value="<?php if(isset($PO_Number)) { echo $PO_Number; } ?>"/>
</p>
<p>
<textarea name="Delivery Address" cols="16" rows="3" readonly id="Address">Delivery Address and Post Code *</textarea>
<textarea name="Delivery_Address" cols="20" rows="3"  ><?php if(isset($Delivery_Address)) { echo $Delivery_Address; } ?></textarea>
<textarea name="Special Requirements" cols="35" rows="3" readonly id="Special Requirements">Special Requirements
(**EG. No of Vegetarians, Delivery Time, Gluten Free/Celiac etc..**)</textarea>
<textarea name="Special_Requirements" cols="23" rows="3" id="Special_Requirements"><?php if(isset($Special_Requirements)) { echo $Special_Requirements; } ?></textarea>
</p>
<input type="submit" name="submit" id="submit" value="Submit">
<form>