Html to this code - PHP Form - php

Question

I am new to php and my webhost does not allow me to run simple php form available on http://www.freecontactform.com/email_form.php
they guided me to a knowledge base and asked me to use this php code i tried to intergrate this with my current form and it just doesn't send any email
Here is the php code:
<?
$mailto = "xyz#yourdomain.com";
$file = "thanks.htm";
$pcount = 0;
$gcount = 0;
$subject = "Mail from Enquiry Form";
$from = "some-name#yourdomain.com";
while (list($key, $val) = each($_POST)) {
$pstr = $pstr . "$key : $val \n ";
++$pcount;
}
while (list($key, $val) = each($_GET)) {
$gstr = $gstr . "$key : $val \n ";
++$gcount;
}
if ($pcount > $gcount) {
$message_body = $pstr;
mail($mailto, $subject, $message_body, "From:" . $from);
include("$file");
} else {
$message_body = $gstr;
mail($mailto, $subject, $message_body, "From:" . $from);
include("$file");
}
?>
Here is the html
http://pastebin.com/Nzq0TCVp
Any suggestions?