<?php
if(isset($cmd)){
if($cmd == "send"){
//Check for the rest of the variable
mail("The email recipient goes here","The subject goes here","The Message goes here");
}
}
?>
<html>
.
.
.
<form action="<?=$PHP_SELF?>">
.
<input type=hidden name=cmd value=send>
</form>
.
.
.
</html>