Try this...
PHP Code:
<?php
$from = $_POST['email'];
$to = "testemail@mail.com";
$subject = "Contact Form Submission";
$body = "Name: ";
$body .= $_REQUEST['Name'] . "\r\n\n";
$body .= "Email: ";
$body .= $_REQUEST['email'] . "\r\n\n";
$body .= "Phone: ";
$body .= $_REQUEST['phone'] . "\r\n\n";
$body .= "Address: ";
$body .= $_REQUEST['address'] . "\r\n\n";
$body .= "Address2: ";
$body .= $_REQUEST['address2'] . "\r\n\n";
$body .= "City: ";
$body .= $_REQUEST['city'] . "\r\n\n";
$body .= "State: ";
$body .= $_REQUEST['state'] . "\r\n\n";
$body .= "Zipcode: ";
$body .= $_REQUEST['zip'] . "\r\n\n";
$body .= "Party Affiliation: ";
$body .= $_REQUEST['party'] . "\r\n\n";
$body .="Message: ";
$body .= $_REQUEST['message'] . "\r\n\n";
mail($from,$to,$subject,$body)
header("Location: thankyou.html");
?>
That should work. Make sure, as the first poster suggested, that you always end your lines with semi-colons. Other than that, I removed < from the e-mail line and just used a PHP redirect instead of a javascript.