<script type="text/javascript">

window.onload=function(){
	document.forms['contactMe'].elements['name'].focus();
}

function checkform ( form )
{
	if (form.name.value == "") {
  	alert( "Please enter your name." );
  	form.name.focus();
  	return false ;
  }
  if (form.email.value == "") {
    alert( "Please enter your email address." );
    form.email.focus();
    return false ;
  }
  if (form.message.value == "") {
  	alert ( "Please enter a message." );
  	form.message.focus();
  	return false ;
  }
  return true ;
}

</script>

<?php

if ($_POST['submitted']) {

    $name = htmlentities($_POST['name']);
    $email = htmlentities($_POST['email']);
    $website = htmlentities($_POST['website']);
    $message = htmlentities($_POST['message']);

    if (!empty($name) && !empty($email) && !empty($message)) {
        $fullMessage = "Name: $name \n \n Email: $email \n \n Website: $website \n \n Message: $message";
        if (mail('example@email.com', 'Contact form submission', $fullMessage,
            "From:$email")) {
            echo "<p><strong>Your message has been received. Thanks!</strong></p>";
        }
    }
}

?>

<form action="contactform.php" method="post" name="contactMe" onsubmit="return checkform(this);">
<p>Name:</p>
<p><input type="text" name="name" size="30" maxlength="30" /></p>
<p>Email:</p>
<p><input type="text" name="email" size="30" maxlength="30" /></p>
<p>Website:</p>
<p><input type="text" name="website" size="30" maxlength="30" /></p>
<p>Message:</p>
<p><textarea name="message" rows="5" cols="5"></textarea></p>
<input type="submit" name="submit" value="Send Message" />
<input type="hidden" name="submitted" value="TRUE" />
</form>