Contact Form Validation problems

I am trying to use PHP to validate a form on a contact page, but I keep getting valid input required errors although all the boxes have been completed.

This is my code:

[code]<?php
$to = ‘[email protected]’;
$subject = ‘Subject Message’;
$contact_submitted = ‘Message displayed after form successfully validates.’;

      function email_is_valid($email) {
        return preg_match('/^[A-Z0-9._%+-]+@[A-Z0-9.-]+\.[A-Z]{2,4}$/i',$email);
      }
      if (!email_is_valid($to)) {
        echo '<p style="color: red;">You must set-up a valid (to) email address before this contact page will work.</p>';
      }
      if (isset($_POST['contact_submitted'])) {
        $return = "\r\n";
        $youremail = trim(htmlspecialchars($_POST['your_email']));
        $yourname = stripslashes(strip_tags($_POST['your_name']));
        $yoursubject = stripslashes(strip_tags($_POST['your_subject']));
        $yourmessage = stripslashes(strip_tags($_POST['your_message']));
        $contact_name = "Name: ".$yourname;
        $subject_text = "Subject: ".$yoursubject;
        $message_text = "Message: ".$yourmessage;
        $message = $contact_name . $return . $subject_text . $return . $message_text;
        $headers = "From: ".$youremail;
        if (email_is_valid($youremail) && !eregi("\r",$youremail) && !eregi("\n",$youremail) && $yourname != "" && $yoursubject != "" && $yourmessage != "" ) {
          mail($to,$subject,$message,$headers);
          $yourname = '';
          $youremail = '';
          $yoursubject = '';
          $yourmessage = '';
          echo '<p style="color: blue;">'.$contact_submitted.'</p>';
        }
        else echo '<p style="color: red;">Please enter your name, a valid email address, a subject, your message before sending your message.</p>';
      }
    ?>[/code]

And the related HTML portion:

[code]

Name

Email Address

Email Address

Message<?php echo $yourmessage; ?>

 

[/code]
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