Thanks for responding. I made a typo in the code ...it's working now .
The only thing that doesn't seem to work is the error section at the bottom of the PHP code (which I left out in my previous post - oops!). If the sender doesn't fill out any field correctly or even leaves it blank, the form sends the message anyway. Here's the missing bit of PHP:
}
else { ?>
<script language="javascript" type="text/javascript">
alert('Message failed. Please try again or contact us directly by phone.');
window.location = 'index.html';
</script>
<?php
}
?>